<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.ptc.com/role/Acquisition" xlink:href="pmtc-20160930.xsd#Acquisition" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/AcquisitionsAcquisitionsPurchasePriceAllocationDetails" xlink:href="pmtc-20160930.xsd#AcquisitionsAcquisitionsPurchasePriceAllocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/AcquisitionsNarrativeDetails" xlink:href="pmtc-20160930.xsd#AcquisitionsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/AcquisitionsTables" xlink:href="pmtc-20160930.xsd#AcquisitionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/CommitmentsAndContingencies" xlink:href="pmtc-20160930.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/CommitmentsAndContingenciesFutureMinimumLeasePaymentsDetails" xlink:href="pmtc-20160930.xsd#CommitmentsAndContingenciesFutureMinimumLeasePaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:href="pmtc-20160930.xsd#CommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/CommitmentsAndContingenciesTables" xlink:href="pmtc-20160930.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/ConsolidatedBalanceSheets" xlink:href="pmtc-20160930.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/ConsolidatedBalanceSheetsParentheticals" xlink:href="pmtc-20160930.xsd#ConsolidatedBalanceSheetsParentheticals" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="pmtc-20160930.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:href="pmtc-20160930.xsd#ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/ConsolidatedStatementsOfComprehensiveLossIncomeParentheticals" xlink:href="pmtc-20160930.xsd#ConsolidatedStatementsOfComprehensiveLossIncomeParentheticals" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/ConsolidatedStatementsOfOperations" xlink:href="pmtc-20160930.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:href="pmtc-20160930.xsd#ConsolidatedStatementsOfStockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/Debt" xlink:href="pmtc-20160930.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DebtDetails" xlink:href="pmtc-20160930.xsd#DebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DebtTables" xlink:href="pmtc-20160930.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsDerivativeInstrumentsAndHedgingActivitiesDisclosureDetails" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsDerivativeInstrumentsAndHedgingActivitiesDisclosureDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsDerivativeInstrumentsAtFairValueDetails" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsDerivativeInstrumentsAtFairValueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsNarrativeDetails" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsNotionalAmountsOfOutstandingForwardContractsDetails" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsNotionalAmountsOfOutstandingForwardContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsOffsettingAssetsDetails" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsOffsettingAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsOffsettingLiabilitiesDetails" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsOffsettingLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsTables" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DerivativeFinancialInstrumentsNotes" xlink:href="pmtc-20160930.xsd#DerivativeFinancialInstrumentsNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentation" xlink:href="pmtc-20160930.xsd#DescriptionOfBusinessAndBasisOfPresentation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentationReclassificationDetails" xlink:href="pmtc-20160930.xsd#DescriptionOfBusinessAndBasisOfPresentationReclassificationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentationSegmentInformationDetails" xlink:href="pmtc-20160930.xsd#DescriptionOfBusinessAndBasisOfPresentationSegmentInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentationTables" xlink:href="pmtc-20160930.xsd#DescriptionOfBusinessAndBasisOfPresentationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/DocumentAndEntityInformation" xlink:href="pmtc-20160930.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EmployeeBenefitPlan" xlink:href="pmtc-20160930.xsd#EmployeeBenefitPlan" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EmployeeBenefitPlanDetails" xlink:href="pmtc-20160930.xsd#EmployeeBenefitPlanDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlan" xlink:href="pmtc-20160930.xsd#EquityIncentivePlan" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlanNarrativeDetails" xlink:href="pmtc-20160930.xsd#EquityIncentivePlanNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlanRestrictedStockActivityDetails" xlink:href="pmtc-20160930.xsd#EquityIncentivePlanRestrictedStockActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlanRestrictedStockAndRestrictedStockUnitGrantsDetails" xlink:href="pmtc-20160930.xsd#EquityIncentivePlanRestrictedStockAndRestrictedStockUnitGrantsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlanScheduleOfRestrictedStockUnitActivityDetails" xlink:href="pmtc-20160930.xsd#EquityIncentivePlanScheduleOfRestrictedStockUnitActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlanTables" xlink:href="pmtc-20160930.xsd#EquityIncentivePlanTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlanTotalStockBasedCompensationExpenseDetails" xlink:href="pmtc-20160930.xsd#EquityIncentivePlanTotalStockBasedCompensationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/EquityIncentivePlanValueOfStockOptionAndStockBasedAwardActivityDetails" xlink:href="pmtc-20160930.xsd#EquityIncentivePlanValueOfStockOptionAndStockBasedAwardActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssets" xlink:href="pmtc-20160930.xsd#GoodwillAndAcquiredIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:href="pmtc-20160930.xsd#GoodwillAndAcquiredIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsGoodwillAndAcquiredIntangibleAssetsDetails" xlink:href="pmtc-20160930.xsd#GoodwillAndAcquiredIntangibleAssetsGoodwillAndAcquiredIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsNarrativeDetails" xlink:href="pmtc-20160930.xsd#GoodwillAndAcquiredIntangibleAssetsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsScheduleOfMovementsOfGoodwillByReportableSegmentDetails" xlink:href="pmtc-20160930.xsd#GoodwillAndAcquiredIntangibleAssetsScheduleOfMovementsOfGoodwillByReportableSegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsTables" xlink:href="pmtc-20160930.xsd#GoodwillAndAcquiredIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxes" xlink:href="pmtc-20160930.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesNarrativeDetails" xlink:href="pmtc-20160930.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:href="pmtc-20160930.xsd#IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesScheduleOfProvisionForBenefitFromIncomeTaxesDetails" xlink:href="pmtc-20160930.xsd#IncomeTaxesScheduleOfProvisionForBenefitFromIncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesScheduleOfUnrecognizedTaxBenefitDetails" xlink:href="pmtc-20160930.xsd#IncomeTaxesScheduleOfUnrecognizedTaxBenefitDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesSummaryOfFederalIncomeTaxRateAndEffectiveIncomeTaxRateDetails" xlink:href="pmtc-20160930.xsd#IncomeTaxesSummaryOfFederalIncomeTaxRateAndEffectiveIncomeTaxRateDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesSummaryOfIncomeLossBeforeIncomeTaxesDetails" xlink:href="pmtc-20160930.xsd#IncomeTaxesSummaryOfIncomeLossBeforeIncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesSummaryOfValuationAllowanceDetails" xlink:href="pmtc-20160930.xsd#IncomeTaxesSummaryOfValuationAllowanceDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/IncomeTaxesTables" xlink:href="pmtc-20160930.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlans" xlink:href="pmtc-20160930.xsd#PensionPlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansAccountingForPensionPlansDetails" xlink:href="pmtc-20160930.xsd#PensionPlansAccountingForPensionPlansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansChangeInAccumulatedOtherComprehensiveLossDetails" xlink:href="pmtc-20160930.xsd#PensionPlansChangeInAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansChangeInBenefitObligationAndPlanAssetsDetails" xlink:href="pmtc-20160930.xsd#PensionPlansChangeInBenefitObligationAndPlanAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansComponentsOfNetPeriodicPensionCostDetails" xlink:href="pmtc-20160930.xsd#PensionPlansComponentsOfNetPeriodicPensionCostDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansExpectedFutureBenefitPaymentsDetails" xlink:href="pmtc-20160930.xsd#PensionPlansExpectedFutureBenefitPaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansFairValueOfPlanAssetsDetails" xlink:href="pmtc-20160930.xsd#PensionPlansFairValueOfPlanAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansNarrativeDetails" xlink:href="pmtc-20160930.xsd#PensionPlansNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansPercentageOfTotalPlanAssetsDetails" xlink:href="pmtc-20160930.xsd#PensionPlansPercentageOfTotalPlanAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PensionPlansTables" xlink:href="pmtc-20160930.xsd#PensionPlansTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PropertyAndEquipment" xlink:href="pmtc-20160930.xsd#PropertyAndEquipment" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PropertyAndEquipmentDetails" xlink:href="pmtc-20160930.xsd#PropertyAndEquipmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/PropertyAndEquipmentTables" xlink:href="pmtc-20160930.xsd#PropertyAndEquipmentTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/RestructuringCharges" xlink:href="pmtc-20160930.xsd#RestructuringCharges" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/RestructuringChargesDetails" xlink:href="pmtc-20160930.xsd#RestructuringChargesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/RestructuringChargesNarrativeDetails" xlink:href="pmtc-20160930.xsd#RestructuringChargesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/RestructuringChargesTables" xlink:href="pmtc-20160930.xsd#RestructuringChargesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SegmentInformation" xlink:href="pmtc-20160930.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SegmentInformationNarrativeDetails" xlink:href="pmtc-20160930.xsd#SegmentInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SegmentInformationRevenueAndOperatingIncomeDetails" xlink:href="pmtc-20160930.xsd#SegmentInformationRevenueAndOperatingIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SegmentInformationRevenueByGeographicSegmentDetails" xlink:href="pmtc-20160930.xsd#SegmentInformationRevenueByGeographicSegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SegmentInformationRevenueByProductSegmentDetails" xlink:href="pmtc-20160930.xsd#SegmentInformationRevenueByProductSegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SegmentInformationTables" xlink:href="pmtc-20160930.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/StockholdersEquity" xlink:href="pmtc-20160930.xsd#StockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/StockholdersEquityDetails" xlink:href="pmtc-20160930.xsd#StockholdersEquityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SubsequentEvents" xlink:href="pmtc-20160930.xsd#SubsequentEvents" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SubsequentEventsNarrativeDetails" xlink:href="pmtc-20160930.xsd#SubsequentEventsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SubsequentEventsScheduleOfRestrictedUnitsGrantedDetails" xlink:href="pmtc-20160930.xsd#SubsequentEventsScheduleOfRestrictedUnitsGrantedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SubsequentEventsTables" xlink:href="pmtc-20160930.xsd#SubsequentEventsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesDeferredRevenueDetails" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesDeferredRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareBasicAndDilutedDetails" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesEarningsPerShareBasicAndDilutedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesMarketableSecuritiesAmortizedCostAndFairValueDetails" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesMarketableSecuritiesAmortizedCostAndFairValueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesMarketableSecuritiesAmortizedCostAndFairValueDetailsCalc2" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesMarketableSecuritiesAmortizedCostAndFairValueDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesPolicy" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesPolicy" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesRelatedPartyTransactionDetails" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesRelatedPartyTransactionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesContingentConsiderationLiabilitiesDetails" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesContingentConsiderationLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="pmtc-20160930.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/Acquisition" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/AcquisitionsAcquisitionsPurchasePriceAllocationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/AcquisitionsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/AcquisitionsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/CommitmentsAndContingenciesFutureMinimumLeasePaymentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6282e4c0-b0bd-9c84-bf43-857ac02b98fc" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8a0692b4-cb50-1eeb-12b4-1509099841b7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6282e4c0-b0bd-9c84-bf43-857ac02b98fc" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8a0692b4-cb50-1eeb-12b4-1509099841b7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_c48f63ae-e409-59ce-5794-cc7ae6139c21" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6282e4c0-b0bd-9c84-bf43-857ac02b98fc" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_c48f63ae-e409-59ce-5794-cc7ae6139c21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_5e342c11-473b-4170-d672-935adcfdb463" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6282e4c0-b0bd-9c84-bf43-857ac02b98fc" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_5e342c11-473b-4170-d672-935adcfdb463" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_baee32aa-bbe2-ead3-1f78-a80f542a97a2" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6282e4c0-b0bd-9c84-bf43-857ac02b98fc" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_baee32aa-bbe2-ead3-1f78-a80f542a97a2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4c8190eb-f692-81f2-35bc-182f11d12444" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6282e4c0-b0bd-9c84-bf43-857ac02b98fc" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_4c8190eb-f692-81f2-35bc-182f11d12444" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_6adcb5b9-fb65-97ee-8a5b-2e780c178728" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_6282e4c0-b0bd-9c84-bf43-857ac02b98fc" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_6adcb5b9-fb65-97ee-8a5b-2e780c178728" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:to="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_0d8009a1-9f3a-b52e-6afc-03d7b3b4df06" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_0d8009a1-9f3a-b52e-6afc-03d7b3b4df06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_edc340b7-5c57-03d7-7d1e-ad6feb822363" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_edc340b7-5c57-03d7-7d1e-ad6feb822363" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_d02cabf3-c4d9-166f-23df-bbec715cbe7f" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_d02cabf3-c4d9-166f-23df-bbec715cbe7f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesCurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesCurrent_27dc1af3-6c96-fe7a-14f7-6183e6b0eedf" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesCurrent_27dc1af3-6c96-fe7a-14f7-6183e6b0eedf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LinesOfCreditCurrent" xlink:label="loc_us-gaap_LinesOfCreditCurrent_ccdc175d-a64e-2b38-2e96-c9738ed96fbd" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_LinesOfCreditCurrent_ccdc175d-a64e-2b38-2e96-c9738ed96fbd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_a33614ee-2047-2d07-d4dc-cd97b29aa0eb" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_DeferredRevenueCurrent_a33614ee-2047-2d07-d4dc-cd97b29aa0eb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_22caddf9-3843-6329-6e39-dc458323b572" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_AccountsPayableCurrent_22caddf9-3843-6329-6e39-dc458323b572" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermLineOfCredit" xlink:label="loc_us-gaap_LongTermLineOfCredit_33c7548e-49d4-eb9b-9956-d96b9654c11e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_LongTermLineOfCredit_33c7548e-49d4-eb9b-9956-d96b9654c11e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="loc_us-gaap_DeferredRevenueNoncurrent_4ca8aac1-2306-11d6-0ee3-d0bcb454b02f" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_DeferredRevenueNoncurrent_4ca8aac1-2306-11d6-0ee3-d0bcb454b02f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_d3900b70-6aae-8c94-5a39-4a06f81c5d62" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_d3900b70-6aae-8c94-5a39-4a06f81c5d62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_7f5c7cfd-4659-429c-35ab-266d67961421" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_7f5c7cfd-4659-429c-35ab-266d67961421" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:to="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_359b0ac4-80ce-a291-f73b-cff103b81eae" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_PreferredStockValue_359b0ac4-80ce-a291-f73b-cff103b81eae" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_ce40a301-9b6b-9fc3-bfb6-dfbb8fcdf29b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_CommonStockValue_ce40a301-9b6b-9fc3-bfb6-dfbb8fcdf29b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_9158c8ad-1189-2464-9c41-553e6a22df6c" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_AdditionalPaidInCapital_9158c8ad-1189-2464-9c41-553e6a22df6c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_dd6b7206-c19f-4dd5-339b-1369c57cfe0f" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_dd6b7206-c19f-4dd5-339b-1369c57cfe0f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_1d565cd0-d7bf-de89-4dbe-a484007b1fe8" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_1d565cd0-d7bf-de89-4dbe-a484007b1fe8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_53d4115f-c3d1-6e9c-3f23-fd144b27061e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:to="loc_us-gaap_CommitmentsAndContingencies_53d4115f-c3d1-6e9c-3f23-fd144b27061e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_cd34decb-53b6-e0a9-28d5-0a9741c4b0f8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_cd34decb-53b6-e0a9-28d5-0a9741c4b0f8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrent" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesCurrent_222b5a74-9526-7448-da46-fccf1775d7c0" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesCurrent_222b5a74-9526-7448-da46-fccf1775d7c0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_4d24e56f-a5cb-07ba-0508-f5f1533ae24e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_4d24e56f-a5cb-07ba-0508-f5f1533ae24e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_290bf57d-cf88-b5a0-ebfc-cf698dca5a98" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_290bf57d-cf88-b5a0-ebfc-cf698dca5a98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_33278e4f-d71c-924a-f185-bd5aaa288d0b" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_OtherAssetsCurrent_33278e4f-d71c-924a-f185-bd5aaa288d0b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_dabadfa8-724e-a2d5-b648-d64b8eabce5a" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_DeferredTaxAssetsNetCurrent_dabadfa8-724e-a2d5-b648-d64b8eabce5a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_894a128f-2068-d267-1e3e-64c93d0ed5ca" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_894a128f-2068-d267-1e3e-64c93d0ed5ca" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesNoncurrent" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesNoncurrent_392a46ef-05fd-68f8-e487-35e85a8f15a1" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesNoncurrent_392a46ef-05fd-68f8-e487-35e85a8f15a1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNetNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_41359e4c-71d8-9161-b054-7e575267275a" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_41359e4c-71d8-9161-b054-7e575267275a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_9b98e689-e6db-3e5b-e5c3-3324fffb4edf" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_9b98e689-e6db-3e5b-e5c3-3324fffb4edf" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/ConsolidatedBalanceSheetsParentheticals" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_d4c99b59-c44a-c4ac-309f-0bddfdb944a5" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_ShareBasedCompensation_d4c99b59-c44a-c4ac-309f-0bddfdb944a5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_783b94c5-664a-4bc7-f813-8c258cc934b7" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_783b94c5-664a-4bc7-f813-8c258cc934b7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_8b437d2d-6bbf-1f71-a341-6d3ac2b36703" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_8b437d2d-6bbf-1f71-a341-6d3ac2b36703" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_b841fb4f-3c0e-cd5c-bbc1-86e011a106f2" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities_b841fb4f-3c0e-cd5c-bbc1-86e011a106f2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_cc07a3ef-f378-8313-6b42-7948b3c915c6" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_cc07a3ef-f378-8313-6b42-7948b3c915c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNoncashExpense" xlink:label="loc_us-gaap_OtherNoncashExpense_116f65e2-2406-9b7b-d73e-3e2903462735" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_OtherNoncashExpense_116f65e2-2406-9b7b-d73e-3e2903462735" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_91d80b53-6368-7466-a11d-02030d33de5c" xlink:type="locator" />
    <link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_91d80b53-6368-7466-a11d-02030d33de5c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_560659f4-b0e9-f2a5-9b69-760dcc1a16c4" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_560659f4-b0e9-f2a5-9b69-760dcc1a16c4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_2b4cdf2a-798e-d1cb-6ae3-f35d605be735" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_2b4cdf2a-798e-d1cb-6ae3-f35d605be735" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_ccf69244-7aaf-19cf-90d6-269f163732c4" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_ccf69244-7aaf-19cf-90d6-269f163732c4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_3eb22aca-47ee-3290-8d2e-e73a1c67010e" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_3eb22aca-47ee-3290-8d2e-e73a1c67010e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_709900d0-f7b0-b950-eae5-eeb8fc36b367" xlink:type="locator" />
    <link:calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_709900d0-f7b0-b950-eae5-eeb8fc36b367" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_6726a997-b874-a6f6-d79f-e0a4bde49905" xlink:type="locator" />
    <link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_6726a997-b874-a6f6-d79f-e0a4bde49905" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_386292ff-155c-0309-455a-2b91b395b3da" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_386292ff-155c-0309-455a-2b91b395b3da" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4852d3ee-c33e-1b07-798c-41e651367343" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4852d3ee-c33e-1b07-798c-41e651367343" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_0fe9734f-4949-ceed-023e-2a3ad290b409" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:to="loc_us-gaap_PaymentsToAcquireInvestments_0fe9734f-4949-ceed-023e-2a3ad290b409" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_PaymentstoBusinessCombinationContingentConsiderationFinancingActivities" xlink:label="loc_pmtc_PaymentstoBusinessCombinationContingentConsiderationFinancingActivities_53BD8614E6FE1CB3EA7CCF43410FE122" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_pmtc_PaymentstoBusinessCombinationContingentConsiderationFinancingActivities_53BD8614E6FE1CB3EA7CCF43410FE122" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfFinancingCosts" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_b6c5edb8-6ac9-5f6a-0029-e36b04d343fe" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_b6c5edb8-6ac9-5f6a-0029-e36b04d343fe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_2660b777-f313-aa0f-f2f0-b727ebbc5b13" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_2660b777-f313-aa0f-f2f0-b727ebbc5b13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_9dbeb004-67a9-1b19-c357-8b5cbf0013ee" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_9dbeb004-67a9-1b19-c357-8b5cbf0013ee" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_8c608436-f07c-e907-aa0d-bfd819a80a12" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_8c608436-f07c-e907-aa0d-bfd819a80a12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_4c2e87e5-41d0-b35b-6dfd-e3ab5b253709" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_4c2e87e5-41d0-b35b-6dfd-e3ab5b253709" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_7d788ff9-1bb0-e85b-e2f1-868916f4ec6d" xlink:type="locator" />
    <link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_7d788ff9-1bb0-e85b-e2f1-868916f4ec6d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_9bd3f42f-b4f0-9974-1138-b2e115f0ecf0" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_9bd3f42f-b4f0-9974-1138-b2e115f0ecf0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_438c1b09-9f50-5f5e-b6af-87ca1807a1a2" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_438c1b09-9f50-5f5e-b6af-87ca1807a1a2" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_640557c9-9806-6bef-9084-9cc792948f77" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_640557c9-9806-6bef-9084-9cc792948f77" xlink:to="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_640557c9-9806-6bef-9084-9cc792948f77" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_2dc03bb1-7e1c-8836-90a9-27405b0684df" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_2dc03bb1-7e1c-8836-90a9-27405b0684df" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_864ab3b9-06fd-bef1-77b0-8160823494a9" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_864ab3b9-06fd-bef1-77b0-8160823494a9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_c455a9b6-0e0d-0fd0-ccd1-4d6957cb4390" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_c455a9b6-0e0d-0fd0-ccd1-4d6957cb4390" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_a1f31de3-c7e0-a595-40ab-859169ebba76" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax_a1f31de3-c7e0-a595-40ab-859169ebba76" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossofForeignCurrencyArisingDuringPeriodNetofTax" xlink:label="loc_pmtc_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossofForeignCurrencyArisingDuringPeriodNetofTax_C2D3D078DE575B25B27BCF62F3526866" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:to="loc_pmtc_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossofForeignCurrencyArisingDuringPeriodNetofTax_C2D3D078DE575B25B27BCF62F3526866" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_7443b8c0-35a8-1f56-7e6b-5e71bdbce930" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_58e3e908-4af5-683d-5a7a-0ca47c8e456d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_7443b8c0-35a8-1f56-7e6b-5e71bdbce930" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_57f718b6-d463-a1a8-7fd5-83810f6bedf1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_7443b8c0-35a8-1f56-7e6b-5e71bdbce930" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_57f718b6-d463-a1a8-7fd5-83810f6bedf1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_65cbf966-17f1-6b91-ff34-d36adae843af" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_7443b8c0-35a8-1f56-7e6b-5e71bdbce930" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_65cbf966-17f1-6b91-ff34-d36adae843af" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/ConsolidatedStatementsOfComprehensiveLossIncomeParentheticals" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c8c6c89-9465-bb81-ea21-29a749a3199b" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c8c6c89-9465-bb81-ea21-29a749a3199b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c8c6c89-9465-bb81-ea21-29a749a3199b" xlink:to="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:to="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_533a4e74-899a-26d7-f9ea-a738a9e615c4" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:to="loc_us-gaap_SalesRevenueNet_533a4e74-899a-26d7-f9ea-a738a9e615c4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LicenseAndMaintenanceRevenue" xlink:label="loc_us-gaap_LicenseAndMaintenanceRevenue_fb96a996-af60-0b55-bd7d-74efc8fa2e7f" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesRevenueNet_533a4e74-899a-26d7-f9ea-a738a9e615c4" xlink:to="loc_us-gaap_LicenseAndMaintenanceRevenue_fb96a996-af60-0b55-bd7d-74efc8fa2e7f" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_Totalrecurringsoftwarerevenue" xlink:label="loc_pmtc_Totalrecurringsoftwarerevenue_7914A5A5A015F4FC9C3E890499A0509B" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LicenseAndMaintenanceRevenue_fb96a996-af60-0b55-bd7d-74efc8fa2e7f" xlink:to="loc_pmtc_Totalrecurringsoftwarerevenue_7914A5A5A015F4FC9C3E890499A0509B" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_Subscriptionlicenserevenue" xlink:label="loc_pmtc_Subscriptionlicenserevenue_4FEDB837A858E434B7D87EBB4E0D291B" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pmtc_Totalrecurringsoftwarerevenue_7914A5A5A015F4FC9C3E890499A0509B" xlink:to="loc_pmtc_Subscriptionlicenserevenue_4FEDB837A858E434B7D87EBB4E0D291B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaintenanceRevenue" xlink:label="loc_us-gaap_MaintenanceRevenue_4a362c63-bc73-e2db-621b-0d6fc1062f67" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pmtc_Totalrecurringsoftwarerevenue_7914A5A5A015F4FC9C3E890499A0509B" xlink:to="loc_us-gaap_MaintenanceRevenue_4a362c63-bc73-e2db-621b-0d6fc1062f67" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_Perpetuallicenserevenue" xlink:label="loc_pmtc_Perpetuallicenserevenue_AE6A2D14D38582D1650E7EBD8E741A11" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LicenseAndMaintenanceRevenue_fb96a996-af60-0b55-bd7d-74efc8fa2e7f" xlink:to="loc_pmtc_Perpetuallicenserevenue_AE6A2D14D38582D1650E7EBD8E741A11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TechnologyServicesRevenue" xlink:label="loc_us-gaap_TechnologyServicesRevenue_d1dff7bc-491f-fbd5-e343-8dab21233b97" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_SalesRevenueNet_533a4e74-899a-26d7-f9ea-a738a9e615c4" xlink:to="loc_us-gaap_TechnologyServicesRevenue_d1dff7bc-491f-fbd5-e343-8dab21233b97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_c0661821-9875-3007-18d3-a24455358c7b" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:to="loc_us-gaap_CostOfRevenue_c0661821-9875-3007-18d3-a24455358c7b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LicenseCosts" xlink:label="loc_us-gaap_LicenseCosts_03eaa955-99e4-c2e3-5340-7b542caa0c68" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfRevenue_c0661821-9875-3007-18d3-a24455358c7b" xlink:to="loc_us-gaap_LicenseCosts_03eaa955-99e4-c2e3-5340-7b542caa0c68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TechnologyServicesCosts" xlink:label="loc_us-gaap_TechnologyServicesCosts_4229207a-e86a-8e13-a974-dec4c51892aa" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfRevenue_c0661821-9875-3007-18d3-a24455358c7b" xlink:to="loc_us-gaap_TechnologyServicesCosts_4229207a-e86a-8e13-a974-dec4c51892aa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:to="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_4466c9c2-563e-0e4c-244e-504a0a74eee1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:to="loc_us-gaap_SellingAndMarketingExpense_4466c9c2-563e-0e4c-244e-504a0a74eee1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_6a3cb05a-f9c0-32f6-d20f-a948f53d0ee5" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_6a3cb05a-f9c0-32f6-d20f-a948f53d0ee5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_69f193f1-2583-2a25-604c-cc949229c2d8" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_69f193f1-2583-2a25-604c-cc949229c2d8" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_AmortizationOfAcquiredIntangibleAssetsExcludingPurchasedSoftware" xlink:label="loc_pmtc_AmortizationOfAcquiredIntangibleAssetsExcludingPurchasedSoftware_3659e2ae-868c-95ab-cf4c-aef584bf5881" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:to="loc_pmtc_AmortizationOfAcquiredIntangibleAssetsExcludingPurchasedSoftware_3659e2ae-868c-95ab-cf4c-aef584bf5881" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_9eeada2d-bc9c-ffca-e02d-8e9d67d5416e" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:to="loc_us-gaap_RestructuringCharges_9eeada2d-bc9c-ffca-e02d-8e9d67d5416e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_cc07a3ef-f378-8313-6b42-7948b3c915c6" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_8281466b-86c7-ec9c-c7fc-3723705ba526" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_cc07a3ef-f378-8313-6b42-7948b3c915c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_7d95006c-ae0a-39bc-bb82-9715342e9a83" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c8c6c89-9465-bb81-ea21-29a749a3199b" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_7d95006c-ae0a-39bc-bb82-9715342e9a83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_f41ffc72-ebad-5797-e151-38939dd37877" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c8c6c89-9465-bb81-ea21-29a749a3199b" xlink:to="loc_us-gaap_InvestmentIncomeInterest_f41ffc72-ebad-5797-e151-38939dd37877" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_8d3aa4ad-dbea-9eba-4578-5d3b83ba3bc6" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c8c6c89-9465-bb81-ea21-29a749a3199b" xlink:to="loc_us-gaap_InterestExpense_8d3aa4ad-dbea-9eba-4578-5d3b83ba3bc6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_51486ac3-3cfb-dff4-43ca-0d3980775a1d" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c8c6c89-9465-bb81-ea21-29a749a3199b" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_51486ac3-3cfb-dff4-43ca-0d3980775a1d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b8dcf191-083d-828d-7b9f-e2d2969b89f4" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_b8dcf191-083d-828d-7b9f-e2d2969b89f4" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/Debt" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DebtDetails" xlink:type="extended">
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_Debtnetofunamortizeddebtissuancecost" xlink:label="loc_pmtc_Debtnetofunamortizeddebtissuancecost_94C4BF8B7310B6A23CAE37C3DF177694" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_b2da023b-baa1-abbb-dd80-71732fab3756" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pmtc_Debtnetofunamortizeddebtissuancecost_94C4BF8B7310B6A23CAE37C3DF177694" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_b2da023b-baa1-abbb-dd80-71732fab3756" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_cfe95596-03de-7254-68f5-816a35661b55" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pmtc_Debtnetofunamortizeddebtissuancecost_94C4BF8B7310B6A23CAE37C3DF177694" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_cfe95596-03de-7254-68f5-816a35661b55" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/DebtTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsDerivativeInstrumentsAndHedgingActivitiesDisclosureDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsDerivativeInstrumentsAtFairValueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsNotionalAmountsOfOutstandingForwardContractsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsOffsettingAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_282a522b-0dbe-55cc-d0ff-ff7b001840dc" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_fd1e77be-9c94-53b9-9ca9-b106b0f86723" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_282a522b-0dbe-55cc-d0ff-ff7b001840dc" xlink:to="loc_us-gaap_DerivativeAssets_fd1e77be-9c94-53b9-9ca9-b106b0f86723" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1996e079-2d62-9d6c-c245-488c4bb3a64a" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssets_fd1e77be-9c94-53b9-9ca9-b106b0f86723" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1996e079-2d62-9d6c-c245-488c4bb3a64a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossLiability" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_b2b81ac1-65fe-e6ea-9cba-62f184681cf0" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssets_fd1e77be-9c94-53b9-9ca9-b106b0f86723" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_b2b81ac1-65fe-e6ea-9cba-62f184681cf0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_249b2b84-587d-65d9-bf59-7c815e59ac52" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_282a522b-0dbe-55cc-d0ff-ff7b001840dc" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_249b2b84-587d-65d9-bf59-7c815e59ac52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnSecurities" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_534c7083-4186-5e18-58b6-cc5eecc43aa5" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_282a522b-0dbe-55cc-d0ff-ff7b001840dc" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_534c7083-4186-5e18-58b6-cc5eecc43aa5" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsOffsettingLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_f5a31501-a035-8caf-0f7c-80183844e690" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_3ec86943-e8f3-0915-acf7-782709b72710" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_f5a31501-a035-8caf-0f7c-80183844e690" xlink:to="loc_us-gaap_DerivativeLiabilities_3ec86943-e8f3-0915-acf7-782709b72710" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_7fd6a8ed-2690-b8b0-d53f-953cb055dd99" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilities_3ec86943-e8f3-0915-acf7-782709b72710" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_7fd6a8ed-2690-b8b0-d53f-953cb055dd99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_b61737dd-70ad-aec6-1afe-bff5d3f985ad" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilities_3ec86943-e8f3-0915-acf7-782709b72710" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_b61737dd-70ad-aec6-1afe-bff5d3f985ad" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimCash" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_6d00db47-0219-b7c0-b166-3549fd340386" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_f5a31501-a035-8caf-0f7c-80183844e690" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_6d00db47-0219-b7c0-b166-3549fd340386" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimSecurities" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_c3d4fef3-eed6-3511-a5f7-8cd7a2bec0be" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_f5a31501-a035-8caf-0f7c-80183844e690" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_c3d4fef3-eed6-3511-a5f7-8cd7a2bec0be" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsDerivativeFinancialInstrumentsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DerivativeFinancialInstrumentsNotes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentationReclassificationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentationSegmentInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DescriptionOfBusinessAndBasisOfPresentationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EmployeeBenefitPlan" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EmployeeBenefitPlanDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlan" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlanNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlanRestrictedStockActivityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlanRestrictedStockAndRestrictedStockUnitGrantsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlanScheduleOfRestrictedStockUnitActivityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlanTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlanTotalStockBasedCompensationExpenseDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/EquityIncentivePlanValueOfStockOptionAndStockBasedAwardActivityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssets" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_682e13ed-74ef-f976-16fa-3796f1bc898f" xlink:type="locator" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_AmortizationOfAcquiredIntangibleAssetsExcludingPurchasedSoftware" xlink:label="loc_pmtc_AmortizationOfAcquiredIntangibleAssetsExcludingPurchasedSoftware_3659e2ae-868c-95ab-cf4c-aef584bf5881" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AmortizationOfIntangibleAssets_682e13ed-74ef-f976-16fa-3796f1bc898f" xlink:to="loc_pmtc_AmortizationOfAcquiredIntangibleAssetsExcludingPurchasedSoftware_3659e2ae-868c-95ab-cf4c-aef584bf5881" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_AmortizationOfAcquiredIntangibleAssetsRecordedInCostOfLicenseRevenue" xlink:label="loc_pmtc_AmortizationOfAcquiredIntangibleAssetsRecordedInCostOfLicenseRevenue_57a21667-34f1-9af5-1174-aef584906eac" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AmortizationOfIntangibleAssets_682e13ed-74ef-f976-16fa-3796f1bc898f" xlink:to="loc_pmtc_AmortizationOfAcquiredIntangibleAssetsRecordedInCostOfLicenseRevenue_57a21667-34f1-9af5-1174-aef584906eac" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsGoodwillAndAcquiredIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill" xlink:label="loc_pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill_d4c90236-5e57-ab1e-a7c1-aef584db1736" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill_d4c90236-5e57-ab1e-a7c1-aef584db1736" xlink:to="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d1f67248-e9b5-f4cc-7b0f-6057f1a3d17a" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill_d4c90236-5e57-ab1e-a7c1-aef584db1736" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d1f67248-e9b5-f4cc-7b0f-6057f1a3d17a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0b66a991-68b5-43d2-3cb3-4ea68bba2b7e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d1f67248-e9b5-f4cc-7b0f-6057f1a3d17a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0b66a991-68b5-43d2-3cb3-4ea68bba2b7e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_5fad788a-33b8-6ace-c3c4-7d91cd9f63e4" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d1f67248-e9b5-f4cc-7b0f-6057f1a3d17a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_5fad788a-33b8-6ace-c3c4-7d91cd9f63e4" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsScheduleOfMovementsOfGoodwillByReportableSegmentDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/GoodwillAndAcquiredIntangibleAssetsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_7ab95885-50a1-f3b5-4737-49b616fc51d6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_c9103802-e01c-0411-2da8-2206c8e6cbaf" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_7ab95885-50a1-f3b5-4737-49b616fc51d6" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_c9103802-e01c-0411-2da8-2206c8e6cbaf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsGross" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_c9103802-e01c-0411-2da8-2206c8e6cbaf" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_2388bf7d-bac3-63e4-7ea0-6e9febb628dd" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_2388bf7d-bac3-63e4-7ea0-6e9febb628dd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_95207891-a935-66fc-7938-a910f0a5c5a8" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_95207891-a935-66fc-7938-a910f0a5c5a8" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_DeferredTaxAssetsCapitalizedResearchAndDevelopment" xlink:label="loc_pmtc_DeferredTaxAssetsCapitalizedResearchAndDevelopment_23eb86ea-7881-ea54-bca8-aef584f0e473" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_pmtc_DeferredTaxAssetsCapitalizedResearchAndDevelopment_23eb86ea-7881-ea54-bca8-aef584f0e473" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_e3b0844b-adc1-217d-22ac-2554ef6bc964" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_e3b0844b-adc1-217d-22ac-2554ef6bc964" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_2bda83ba-0db3-98b0-761b-d8fe7c271584" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_2bda83ba-0db3-98b0-761b-d8fe7c271584" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_11af201b-713a-e639-e3e5-2a2e9be5b0c6" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_11af201b-713a-e639-e3e5-2a2e9be5b0c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_58c99b2d-2ce3-9719-3d56-d30ecab82460" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_58c99b2d-2ce3-9719-3d56-d30ecab82460" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_DeferredTaxAssetAmortizationOfIntangibleAssets" xlink:label="loc_pmtc_DeferredTaxAssetAmortizationOfIntangibleAssets_88ceae52-43a4-fb82-b958-aef58501f35f" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_pmtc_DeferredTaxAssetAmortizationOfIntangibleAssets_88ceae52-43a4-fb82-b958-aef58501f35f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_351e9f9c-f3e3-2db3-110c-394de97ab52e" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_351e9f9c-f3e3-2db3-110c-394de97ab52e" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_DeferredTaxAssetsDepreciation" xlink:label="loc_pmtc_DeferredTaxAssetsDepreciation_e0db03a6-7619-62c8-c8f0-aef5850a9bc6" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_pmtc_DeferredTaxAssetsDepreciation_e0db03a6-7619-62c8-c8f0-aef5850a9bc6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_d2894808-c556-546c-7bdb-cf4d5d84446f" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_d2894808-c556-546c-7bdb-cf4d5d84446f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsCapitalLossCarryforwards" xlink:label="loc_us-gaap_DeferredTaxAssetsCapitalLossCarryforwards_91daf386-c1bb-3bba-2564-24380dc126ed" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_us-gaap_DeferredTaxAssetsCapitalLossCarryforwards_91daf386-c1bb-3bba-2564-24380dc126ed" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_DeferredTaxAssetDeferredInterest" xlink:label="loc_pmtc_DeferredTaxAssetDeferredInterest_B8954C428640E998D5B326F9C30416B9" xlink:type="locator" />
    <link:calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_ae76b0a4-0e26-3d8f-4ecb-c8186dd802d0" xlink:to="loc_pmtc_DeferredTaxAssetDeferredInterest_B8954C428640E998D5B326F9C30416B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_43429341-a7f8-3d28-8300-64e1feef8fa0" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_c9103802-e01c-0411-2da8-2206c8e6cbaf" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_43429341-a7f8-3d28-8300-64e1feef8fa0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_3e14f64d-d2f6-3fdd-a49d-772a2e1ab66a" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_7ab95885-50a1-f3b5-4737-49b616fc51d6" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_3e14f64d-d2f6-3fdd-a49d-772a2e1ab66a" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_DeferredTaxLiabilitiesAcquiredIntangibleAssets" xlink:label="loc_pmtc_DeferredTaxLiabilitiesAcquiredIntangibleAssets_6c9b5327-7923-7088-321d-aef584f5ae40" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_3e14f64d-d2f6-3fdd-a49d-772a2e1ab66a" xlink:to="loc_pmtc_DeferredTaxLiabilitiesAcquiredIntangibleAssets_6c9b5327-7923-7088-321d-aef584f5ae40" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPrepaidExpenses" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_e40fbc7e-e577-3a13-10f2-03285653a3e0" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_3e14f64d-d2f6-3fdd-a49d-772a2e1ab66a" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_e40fbc7e-e577-3a13-10f2-03285653a3e0" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_DeferredTaxLiabilitiesDeferredIncome" xlink:label="loc_pmtc_DeferredTaxLiabilitiesDeferredIncome_aa5941c0-5339-4666-5813-aef584e29828" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_3e14f64d-d2f6-3fdd-a49d-772a2e1ab66a" xlink:to="loc_pmtc_DeferredTaxLiabilitiesDeferredIncome_aa5941c0-5339-4666-5813-aef584e29828" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_24ce0b8b-7683-acd6-b39f-77940dbca72b" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_3e14f64d-d2f6-3fdd-a49d-772a2e1ab66a" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_24ce0b8b-7683-acd6-b39f-77940dbca72b" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesScheduleOfProvisionForBenefitFromIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b8dcf191-083d-828d-7b9f-e2d2969b89f4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_34234baa-d101-3f73-2c90-9ccf83248ac9" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_b8dcf191-083d-828d-7b9f-e2d2969b89f4" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_34234baa-d101-3f73-2c90-9ccf83248ac9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_bbeff925-a146-2078-8abf-f4cd97255735" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_34234baa-d101-3f73-2c90-9ccf83248ac9" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_bbeff925-a146-2078-8abf-f4cd97255735" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_1be7a3a1-cbc3-8ffe-f157-edb51cd26a68" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_34234baa-d101-3f73-2c90-9ccf83248ac9" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_1be7a3a1-cbc3-8ffe-f157-edb51cd26a68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_2ac2b83b-7587-ac08-d667-af95bd01fbb2" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_34234baa-d101-3f73-2c90-9ccf83248ac9" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_2ac2b83b-7587-ac08-d667-af95bd01fbb2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_8b437d2d-6bbf-1f71-a341-6d3ac2b36703" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_b8dcf191-083d-828d-7b9f-e2d2969b89f4" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_8b437d2d-6bbf-1f71-a341-6d3ac2b36703" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_0a099f0c-8f61-7b47-fb6f-d9dfccab6a2b" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_8b437d2d-6bbf-1f71-a341-6d3ac2b36703" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_0a099f0c-8f61-7b47-fb6f-d9dfccab6a2b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_de4150a6-31ba-55b3-12d4-35cb377c9ca2" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_8b437d2d-6bbf-1f71-a341-6d3ac2b36703" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_de4150a6-31ba-55b3-12d4-35cb377c9ca2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_01bd828d-ff2f-1258-4ecb-6afd711760b6" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_8b437d2d-6bbf-1f71-a341-6d3ac2b36703" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_01bd828d-ff2f-1258-4ecb-6afd711760b6" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesScheduleOfUnrecognizedTaxBenefitDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesSummaryOfFederalIncomeTaxRateAndEffectiveIncomeTaxRateDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_acf5d13d-61d7-58c0-7f7b-a5c0f7cb7066" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_acf5d13d-61d7-58c0-7f7b-a5c0f7cb7066" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_ae3561e4-ce43-53a8-871d-507f741a2369" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_ae3561e4-ce43-53a8-871d-507f741a2369" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_4b3be44f-5687-e783-ac34-c53c5c3f10e0" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_4b3be44f-5687-e783-ac34-c53c5c3f10e0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_6bbeca8f-a74f-62c9-14cf-944a068a4d23" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_6bbeca8f-a74f-62c9-14cf-944a068a4d23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements_418f0370-47c3-0f72-ac9b-2b99f1b3b259" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements_418f0370-47c3-0f72-ac9b-2b99f1b3b259" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_79b52493-ed4b-fb62-5daf-e1982275e67b" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_79b52493-ed4b-fb62-5daf-e1982275e67b" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxWithholdingPercent" xlink:label="loc_pmtc_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxWithholdingPercent_2572975b-b5c6-c0c6-55d2-aef58506dad5" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_pmtc_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxWithholdingPercent_2572975b-b5c6-c0c6-55d2-aef58506dad5" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_EffectiveIncomeTaxRateReconciliationOther" xlink:label="loc_pmtc_EffectiveIncomeTaxRateReconciliationOther_689b09fd-a6d7-58e1-6900-aef58453e2d9" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_pmtc_EffectiveIncomeTaxRateReconciliationOther_689b09fd-a6d7-58e1-6900-aef58453e2d9" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_EffectiveIncomeTaxRateReconciliationPermanentDomesticItemsPercent" xlink:label="loc_pmtc_EffectiveIncomeTaxRateReconciliationPermanentDomesticItemsPercent_66734CA4981D99FA81F8EDD601AD60DC" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_037594ef-c95d-7169-0f2c-0d9bf9c6587e" xlink:to="loc_pmtc_EffectiveIncomeTaxRateReconciliationPermanentDomesticItemsPercent_66734CA4981D99FA81F8EDD601AD60DC" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesSummaryOfIncomeLossBeforeIncomeTaxesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesSummaryOfValuationAllowanceDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlans" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansAccountingForPensionPlansDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansChangeInAccumulatedOtherComprehensiveLossDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansChangeInBenefitObligationAndPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_7d86be81-a59a-b540-d0cf-6f53ea1bf026" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2895206d-54be-79ab-0fc1-f9afd53a9d56" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_7d86be81-a59a-b540-d0cf-6f53ea1bf026" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2895206d-54be-79ab-0fc1-f9afd53a9d56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_7bc676df-6587-5f2f-7f87-a3fb6209be50" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_7d86be81-a59a-b540-d0cf-6f53ea1bf026" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_7bc676df-6587-5f2f-7f87-a3fb6209be50" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansComponentsOfNetPeriodicPensionCostDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_2ec65622-4890-2364-d89a-c6403a1d04a9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_6183ad76-cfec-d832-340d-85dc815112da" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_2ec65622-4890-2364-d89a-c6403a1d04a9" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_6183ad76-cfec-d832-340d-85dc815112da" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_966abc5a-0aea-5fe8-d8a1-9e044afb9784" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_2ec65622-4890-2364-d89a-c6403a1d04a9" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_966abc5a-0aea-5fe8-d8a1-9e044afb9784" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_313a5f98-4635-6c34-4024-f94b2c5b9063" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_2ec65622-4890-2364-d89a-c6403a1d04a9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_313a5f98-4635-6c34-4024-f94b2c5b9063" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_2b770c62-b0fb-c708-98e5-41278be9cb84" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_2ec65622-4890-2364-d89a-c6403a1d04a9" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_2b770c62-b0fb-c708-98e5-41278be9cb84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_ba702cef-8d4b-17f2-0b31-74e9eb092d82" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_2ec65622-4890-2364-d89a-c6403a1d04a9" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_ba702cef-8d4b-17f2-0b31-74e9eb092d82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_cc07a3ef-f378-8313-6b42-7948b3c915c6" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_2ec65622-4890-2364-d89a-c6403a1d04a9" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_cc07a3ef-f378-8313-6b42-7948b3c915c6" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansExpectedFutureBenefitPaymentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansFairValueOfPlanAssetsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansPercentageOfTotalPlanAssetsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PensionPlansTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PropertyAndEquipment" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/PropertyAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_b84a1570-30ad-4e3a-2391-9767a64e15fd" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_b84a1570-30ad-4e3a-2391-9767a64e15fd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_6591f040-08b3-69a1-a560-c70736475ada" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_6591f040-08b3-69a1-a560-c70736475ada" xlink:type="arc" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_ComputerHardwareAndSoftware" xlink:label="loc_pmtc_ComputerHardwareAndSoftware_3f8e726b-1617-96c0-9be8-aef584344dc0" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_6591f040-08b3-69a1-a560-c70736475ada" xlink:to="loc_pmtc_ComputerHardwareAndSoftware_3f8e726b-1617-96c0-9be8-aef584344dc0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FurnitureAndFixturesGross" xlink:label="loc_us-gaap_FurnitureAndFixturesGross_d63fd3fd-4444-a091-d95a-6eb67f429c4c" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_6591f040-08b3-69a1-a560-c70736475ada" xlink:to="loc_us-gaap_FurnitureAndFixturesGross_d63fd3fd-4444-a091-d95a-6eb67f429c4c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LeaseholdImprovementsGross" xlink:label="loc_us-gaap_LeaseholdImprovementsGross_e0b7ea08-053f-5432-d792-3b4214a3d7ab" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_6591f040-08b3-69a1-a560-c70736475ada" xlink:to="loc_us-gaap_LeaseholdImprovementsGross_e0b7ea08-053f-5432-d792-3b4214a3d7ab" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/PropertyAndEquipmentTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/RestructuringCharges" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/RestructuringChargesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/RestructuringChargesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/RestructuringChargesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SegmentInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SegmentInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SegmentInformationRevenueAndOperatingIncomeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SegmentInformationRevenueByGeographicSegmentDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SegmentInformationRevenueByProductSegmentDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/StockholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/StockholdersEquityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SubsequentEvents" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SubsequentEventsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SubsequentEventsScheduleOfRestrictedUnitsGrantedDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SubsequentEventsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesDeferredRevenueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareBasicAndDilutedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_ca9bebe4-4073-b721-7b75-1a0086593d58" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8afbf9ec-40f2-ac04-dde9-64f96fdfbf74" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_ca9bebe4-4073-b721-7b75-1a0086593d58" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8afbf9ec-40f2-ac04-dde9-64f96fdfbf74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_0449447d-2475-b5e7-892e-ced6d0229840" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_ca9bebe4-4073-b721-7b75-1a0086593d58" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_0449447d-2475-b5e7-892e-ced6d0229840" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureRecurring" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureRecurring_0b499716-48cc-2eec-ff77-d31d0fbee7d4" xlink:type="locator" />
    <link:loc xlink:href="pmtc-20160930.xsd#pmtc_ContingentConsiderationLiabilityFairValueDisclosure" xlink:label="loc_pmtc_ContingentConsiderationLiabilityFairValueDisclosure_8d4884a4-98d8-ce12-6352-aef584529b51" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureRecurring_0b499716-48cc-2eec-ff77-d31d0fbee7d4" xlink:to="loc_pmtc_ContingentConsiderationLiabilityFairValueDisclosure_8d4884a4-98d8-ce12-6352-aef584529b51" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_3ec86943-e8f3-0915-acf7-782709b72710" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureRecurring_0b499716-48cc-2eec-ff77-d31d0fbee7d4" xlink:to="loc_us-gaap_DerivativeLiabilities_3ec86943-e8f3-0915-acf7-782709b72710" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsFairValueDisclosureRecurring" xlink:label="loc_us-gaap_AssetsFairValueDisclosureRecurring_e0a3f8d4-7813-c0c0-39f3-9322c7254d0c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_074f42d4-7f64-aa49-46b6-c8bd9ead085f" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosureRecurring_e0a3f8d4-7813-c0c0-39f3-9322c7254d0c" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_074f42d4-7f64-aa49-46b6-c8bd9ead085f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_fd1e77be-9c94-53b9-9ca9-b106b0f86723" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosureRecurring_e0a3f8d4-7813-c0c0-39f3-9322c7254d0c" xlink:to="loc_us-gaap_DerivativeAssets_fd1e77be-9c94-53b9-9ca9-b106b0f86723" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_a6e76a34-fa42-d66f-a2a4-5865ce92446b" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosureRecurring_e0a3f8d4-7813-c0c0-39f3-9322c7254d0c" xlink:to="loc_us-gaap_AvailableForSaleSecurities_a6e76a34-fa42-d66f-a2a4-5865ce92446b" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesMarketableSecuritiesAmortizedCostAndFairValueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_fc1c6482-bc06-c49d-f5fe-3b9e6e37b9c3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_be58631c-e521-cbea-4a6a-bb73267cca32" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_fc1c6482-bc06-c49d-f5fe-3b9e6e37b9c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_be58631c-e521-cbea-4a6a-bb73267cca32" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_38dc7be8-8ce2-e499-877f-64a027da430a" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_fc1c6482-bc06-c49d-f5fe-3b9e6e37b9c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_38dc7be8-8ce2-e499-877f-64a027da430a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_a6e76a34-fa42-d66f-a2a4-5865ce92446b" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_6d858682-9796-369e-ed53-f416924b592f" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecurities_a6e76a34-fa42-d66f-a2a4-5865ce92446b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_6d858682-9796-369e-ed53-f416924b592f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_09c08fbe-a3bf-57ab-0284-44a471d01295" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecurities_a6e76a34-fa42-d66f-a2a4-5865ce92446b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_09c08fbe-a3bf-57ab-0284-44a471d01295" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesMarketableSecuritiesAmortizedCostAndFairValueDetailsCalc2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_1279A5A5B22E71A01B046594E11BF02D_fc1c6482-bc06-c49d-f5fe-3b9e6e37b9c3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_1279A5A5B22E71A01B046594E11BF02D_d5cbedb3-d62c-f015-a49f-ef377e438819" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_1279A5A5B22E71A01B046594E11BF02D_fc1c6482-bc06-c49d-f5fe-3b9e6e37b9c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_1279A5A5B22E71A01B046594E11BF02D_d5cbedb3-d62c-f015-a49f-ef377e438819" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_1279A5A5B22E71A01B046594E11BF02D_258c41aa-2b09-923b-df97-cb86ef48f935" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_1279A5A5B22E71A01B046594E11BF02D_fc1c6482-bc06-c49d-f5fe-3b9e6e37b9c3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_1279A5A5B22E71A01B046594E11BF02D_258c41aa-2b09-923b-df97-cb86ef48f935" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_1279A5A5B22E71A01B046594E11BF02D_a6e76a34-fa42-d66f-a2a4-5865ce92446b" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_1279A5A5B22E71A01B046594E11BF02D_fc1c6482-bc06-c49d-f5fe-3b9e6e37b9c3" xlink:to="loc_us-gaap_AvailableForSaleSecurities_1279A5A5B22E71A01B046594E11BF02D_a6e76a34-fa42-d66f-a2a4-5865ce92446b" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesPolicy" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesRelatedPartyTransactionDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesContingentConsiderationLiabilitiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.ptc.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
</link:linkbase>
