<?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.dxpe.com/role/CommitmentsAndContingencies" xlink:href="dxpe-20190630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/Company" xlink:href="dxpe-20190630.xsd#Company" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CompanyDetails" xlink:href="dxpe-20190630.xsd#CompanyDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheets" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfEquity" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedStatementsOfEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContracts" xlink:href="dxpe-20190630.xsd#CostsAndEstimatedProfitsOnUncompletedContracts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsDetails" xlink:href="dxpe-20190630.xsd#CostsAndEstimatedProfitsOnUncompletedContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsTables" xlink:href="dxpe-20190630.xsd#CostsAndEstimatedProfitsOnUncompletedContractsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/DocumentAndEntityInformation" xlink:href="dxpe-20190630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/EarningsPerShareData" xlink:href="dxpe-20190630.xsd#EarningsPerShareData" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/EarningsPerShareDataDetails" xlink:href="dxpe-20190630.xsd#EarningsPerShareDataDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/EarningsPerShareDataTables" xlink:href="dxpe-20190630.xsd#EarningsPerShareDataTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilities" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesQuantitativeInformationAboutLevel3Details" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesQuantitativeInformationAboutLevel3Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesReconciliationOfBeginningAndEndingBalancesDetails" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesReconciliationOfBeginningAndEndingBalancesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/IncomeTaxes" xlink:href="dxpe-20190630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/IncomeTaxesDetails" xlink:href="dxpe-20190630.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/Inventories" xlink:href="dxpe-20190630.xsd#Inventories" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/InventoriesDetails" xlink:href="dxpe-20190630.xsd#InventoriesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/InventoriesTables" xlink:href="dxpe-20190630.xsd#InventoriesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/Leases" xlink:href="dxpe-20190630.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesContractualObligationsRelatedToOperatingLeasesUnderAsc840Details" xlink:href="dxpe-20190630.xsd#LeasesContractualObligationsRelatedToOperatingLeasesUnderAsc840Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesLeaseExpenseDetails" xlink:href="dxpe-20190630.xsd#LeasesLeaseExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesLeaseTermAndDiscountRateDetails" xlink:href="dxpe-20190630.xsd#LeasesLeaseTermAndDiscountRateDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesMaturityOfLeaseLiabilitiesDetails" xlink:href="dxpe-20190630.xsd#LeasesMaturityOfLeaseLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesMaturityOfLeaseLiabilitiesDetailsCalc2" xlink:href="dxpe-20190630.xsd#LeasesMaturityOfLeaseLiabilitiesDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesNarrativeDetails" xlink:href="dxpe-20190630.xsd#LeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:href="dxpe-20190630.xsd#LeasesSupplementalBalanceSheetInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesSupplementalCashFlowInformationDetails" xlink:href="dxpe-20190630.xsd#LeasesSupplementalCashFlowInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesTables" xlink:href="dxpe-20190630.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LongTermDebt" xlink:href="dxpe-20190630.xsd#LongTermDebt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LongTermDebtDetails" xlink:href="dxpe-20190630.xsd#LongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LongTermDebtTables" xlink:href="dxpe-20190630.xsd#LongTermDebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/RecentAccountingPronouncements" xlink:href="dxpe-20190630.xsd#RecentAccountingPronouncements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/RecentAccountingPronouncementsPolicies" xlink:href="dxpe-20190630.xsd#RecentAccountingPronouncementsPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReporting" xlink:href="dxpe-20190630.xsd#SegmentReporting" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingFinancialInformationOfCompanysSegmentsDetails" xlink:href="dxpe-20190630.xsd#SegmentReportingFinancialInformationOfCompanysSegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingIdentifiableAssetsBySegmentsDetails" xlink:href="dxpe-20190630.xsd#SegmentReportingIdentifiableAssetsBySegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingReconciliationOfOperatingIncomeToConsolidatedIncomeDetails" xlink:href="dxpe-20190630.xsd#SegmentReportingReconciliationOfOperatingIncomeToConsolidatedIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingTables" xlink:href="dxpe-20190630.xsd#SegmentReportingTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SubsequentEvents" xlink:href="dxpe-20190630.xsd#SubsequentEvents" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SummaryOfSignificantAccountingAndBusinessPolicies" xlink:href="dxpe-20190630.xsd#SummaryOfSignificantAccountingAndBusinessPolicies" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/Company" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CompanyDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_0d8925ae-714a-26e4-aa69-2d9eac65a5c6" 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_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:to="loc_us-gaap_LongTermDebtCurrent_0d8925ae-714a-26e4-aa69-2d9eac65a5c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableTradeCurrent" xlink:label="loc_us-gaap_AccountsPayableTradeCurrent_589b663d-e7a6-26ab-df54-c79373777c21" 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_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:to="loc_us-gaap_AccountsPayableTradeCurrent_589b663d-e7a6-26ab-df54-c79373777c21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_b0e2721e-44a1-957d-5aaa-294b580a15e3" 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_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_b0e2721e-44a1-957d-5aaa-294b580a15e3" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_ContractWithCustomerLiabilityCustomerAdvancesCurrent" xlink:label="loc_dxpe_ContractWithCustomerLiabilityCustomerAdvancesCurrent_f90438be-a611-3c78-9e3e-fd033e2e9bad" 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_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:to="loc_dxpe_ContractWithCustomerLiabilityCustomerAdvancesCurrent_f90438be-a611-3c78-9e3e-fd033e2e9bad" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_1beea529-7ff9-f264-77a3-b82530469f83" 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_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_1beea529-7ff9-f264-77a3-b82530469f83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_09c9f846-159b-1776-fceb-d1cad0eb94ab" 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_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_09c9f846-159b-1776-fceb-d1cad0eb94ab" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_4bcdb937-432e-7a7e-23c2-a441d7b89da5" 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_2dcbbde2-9146-a0ba-7f6c-c71b481e0841" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_4bcdb937-432e-7a7e-23c2-a441d7b89da5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_f7f6a3c1-4b60-6e47-4dbc-badebe1fbd2c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_bba08e5f-78e8-6c25-01a4-6720051135cc" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_f7f6a3c1-4b60-6e47-4dbc-badebe1fbd2c" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_bba08e5f-78e8-6c25-01a4-6720051135cc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_fcfc6b17-bfc5-2ebc-3fc1-751aa446a572" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_f7f6a3c1-4b60-6e47-4dbc-badebe1fbd2c" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_fcfc6b17-bfc5-2ebc-3fc1-751aa446a572" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_d3ba3006-9df7-8186-2eb2-dc5094562cfe" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_f7f6a3c1-4b60-6e47-4dbc-badebe1fbd2c" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_d3ba3006-9df7-8186-2eb2-dc5094562cfe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_7e28dff2-da63-21d2-137e-ce9d56cb1b6e" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesNoncurrent_f7f6a3c1-4b60-6e47-4dbc-badebe1fbd2c" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_7e28dff2-da63-21d2-137e-ce9d56cb1b6e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" 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_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_Liabilities_066608da-f041-4af6-3da0-95354b640e11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_f0c68f4f-7ec1-d447-8ba7-0f2766abbe67" 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_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_CommitmentsAndContingencies_f0c68f4f-7ec1-d447-8ba7-0f2766abbe67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" 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_63817d40-f759-fa9c-45a5-8bbbb36ed5c9" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_a9feabf5-0bf0-3efe-740e-f5e41a4b3194" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:to="loc_us-gaap_MinorityInterest_a9feabf5-0bf0-3efe-740e-f5e41a4b3194" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e0c0480e-e6f5-c4df-ce25-1ffa4a8c827a" xlink:to="loc_us-gaap_StockholdersEquity_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_ea289a9d-deba-2cde-21e4-3d0ae7a1f011" 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_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:to="loc_us-gaap_PreferredStockValue_ea289a9d-deba-2cde-21e4-3d0ae7a1f011" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_aefe3f0c-abe4-5b83-9a64-da77d8e253dd" 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_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:to="loc_us-gaap_CommonStockValue_aefe3f0c-abe4-5b83-9a64-da77d8e253dd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_6dca832a-861c-478d-b1a0-396533beb40d" 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_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:to="loc_us-gaap_AdditionalPaidInCapital_6dca832a-861c-478d-b1a0-396533beb40d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a59bc5ae-63a0-c9bc-32f7-e2bd9f32bd26" 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_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_a59bc5ae-63a0-c9bc-32f7-e2bd9f32bd26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_798442bf-12e1-d944-3fa1-8b797b67482e" 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_6765f135-8c69-bebc-a116-d59a52a5b2f2" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_798442bf-12e1-d944-3fa1-8b797b67482e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_96dd7052-744e-d270-4e77-67944ec39152" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" 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_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_AssetsCurrent_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_32f41ea9-05c6-e713-464b-586a571d1c1f" 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_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_32f41ea9-05c6-e713-464b-586a571d1c1f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedCashCurrent" xlink:label="loc_us-gaap_RestrictedCashCurrent_81b308b1-c4ff-480c-3942-2317dfd5262a" 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_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:to="loc_us-gaap_RestrictedCashCurrent_81b308b1-c4ff-480c-3942-2317dfd5262a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_928a1618-af56-709a-989c-a303706b8ca2" 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_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_928a1618-af56-709a-989c-a303706b8ca2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_66bcd79a-a1c3-c24d-b8b4-7a0ce373714b" 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_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:to="loc_us-gaap_InventoryNet_66bcd79a-a1c3-c24d-b8b4-7a0ce373714b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_120d87ed-4228-6812-13f3-5c322e959d0e" 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_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_120d87ed-4228-6812-13f3-5c322e959d0e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_ce9014ac-0ac4-6ed2-b53f-a0edc046d6b4" 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_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_ce9014ac-0ac4-6ed2-b53f-a0edc046d6b4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_us-gaap_IncomeTaxesReceivable_ebb94f1a-1386-5eed-9402-f0f0e2cd300b" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_d79dcc1c-93de-0ecd-2bd5-7c1f224c9b98" xlink:to="loc_us-gaap_IncomeTaxesReceivable_ebb94f1a-1386-5eed-9402-f0f0e2cd300b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_f37ad080-c77a-efc5-c936-389b16abc420" 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_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_f37ad080-c77a-efc5-c936-389b16abc420" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_831ad0b9-9dba-3997-20e6-e99a19aa28db" 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_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_Goodwill_831ad0b9-9dba-3997-20e6-e99a19aa28db" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherIntangibleAssetsNet" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_1049a9ec-1e76-a167-8d3f-9aaf6ffd4636" 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_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_1049a9ec-1e76-a167-8d3f-9aaf6ffd4636" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_ddb0d184-2205-2a10-5b0e-faf2ccd717ae" 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_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_ddb0d184-2205-2a10-5b0e-faf2ccd717ae" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_52f5671e-53e6-6055-795e-6bd414fd86c2" 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_96dd7052-744e-d270-4e77-67944ec39152" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_52f5671e-53e6-6055-795e-6bd414fd86c2" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_9743d583-dfae-6ae9-f133-a1e331df792c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_714a30d1-878f-1497-8ad1-4b1e113da228" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_9743d583-dfae-6ae9-f133-a1e331df792c" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_714a30d1-878f-1497-8ad1-4b1e113da228" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_9743d583-dfae-6ae9-f133-a1e331df792c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d8917e24-06dd-060d-a290-e426c7895e54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_cfa1e746-5920-c3b5-33ed-a7dee018f26c" 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_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_cfa1e746-5920-c3b5-33ed-a7dee018f26c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="loc_us-gaap_PaymentsOfDividends_13cc8818-e792-6246-5e41-c56e1150a319" 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_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsOfDividends_13cc8818-e792-6246-5e41-c56e1150a319" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_6accd1a2-f190-7888-29dd-29802af49bdc" 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_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_6accd1a2-f190-7888-29dd-29802af49bdc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_8ca40fc7-564f-832a-56a7-2cfd188fe573" 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_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_8ca40fc7-564f-832a-56a7-2cfd188fe573" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_43305c85-41ff-3d0f-c464-dc8983363bce" 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_d8917e24-06dd-060d-a290-e426c7895e54" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_43305c85-41ff-3d0f-c464-dc8983363bce" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_9743d583-dfae-6ae9-f133-a1e331df792c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_8aa68cfb-2df7-9a23-d1ed-4fe33385b4a2" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_ProfitLoss_8aa68cfb-2df7-9a23-d1ed-4fe33385b4a2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_38b416a4-4707-fba3-1084-9b8a37fd745a" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_Depreciation_38b416a4-4707-fba3-1084-9b8a37fd745a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_afd0f625-a29a-3806-bad0-ad0ca19e7015" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_afd0f625-a29a-3806-bad0-ad0ca19e7015" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_3efa67a8-b5d1-d104-f06b-ebff325bad28" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_3efa67a8-b5d1-d104-f06b-ebff325bad28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_ef1b7738-192b-a4ca-6396-5577f303c271" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_ef1b7738-192b-a4ca-6396-5577f303c271" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_72092153-6d23-6ed2-386d-5561faf5c226" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_72092153-6d23-6ed2-386d-5561faf5c226" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_BusinessCombinationContingentConsiderationArrangementsChangeinAmountofContingentConsiderationinExcessofFairValue" xlink:label="loc_dxpe_BusinessCombinationContingentConsiderationArrangementsChangeinAmountofContingentConsiderationinExcessofFairValue_6826FC5AFF421459C21D8E9D378D7A31" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_dxpe_BusinessCombinationContingentConsiderationArrangementsChangeinAmountofContingentConsiderationinExcessofFairValue_6826FC5AFF421459C21D8E9D378D7A31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_9dbcf839-4ba1-0e2b-8942-4c8a9981ac5b" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_9dbcf839-4ba1-0e2b-8942-4c8a9981ac5b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_b412c390-dfec-d4c8-f13e-036e3b49278c" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_b412c390-dfec-d4c8-f13e-036e3b49278c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_90cbc3ab-f555-6407-b3b4-b2bfa84c9f18" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_ShareBasedCompensation_90cbc3ab-f555-6407-b3b4-b2bfa84c9f18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_e8a9abf2-38d3-77d1-fb6b-693fef632294" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_e8a9abf2-38d3-77d1-fb6b-693fef632294" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_5f96c19e-85fe-99f6-cec0-c2c9d7470ed4" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_5f96c19e-85fe-99f6-cec0-c2c9d7470ed4" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_CostsAndEstimatedProfitsInExcessOfBillings" xlink:label="loc_dxpe_CostsAndEstimatedProfitsInExcessOfBillings_bf491b35-9978-16f7-51c8-fd033e2d54cb" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_dxpe_CostsAndEstimatedProfitsInExcessOfBillings_bf491b35-9978-16f7-51c8-fd033e2d54cb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_334f1d33-7cae-7fd2-9d83-bb387fc2f3dd" 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_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_334f1d33-7cae-7fd2-9d83-bb387fc2f3dd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_0e4168a9-901d-abb5-15c0-3622e9e2c070" xlink:type="locator" />
    <link:calculationArc order="15" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_0e4168a9-901d-abb5-15c0-3622e9e2c070" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_91c354d1-d18f-051e-80cb-f13c01058b9d" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_91c354d1-d18f-051e-80cb-f13c01058b9d" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_IncreaseDecreaseInBillingsInExcessOfCostsAndEstimatedProfits" xlink:label="loc_dxpe_IncreaseDecreaseInBillingsInExcessOfCostsAndEstimatedProfits_3004b86d-d2f4-dbde-8c3e-fd033e2fd9f9" xlink:type="locator" />
    <link:calculationArc order="17" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_dxpe_IncreaseDecreaseInBillingsInExcessOfCostsAndEstimatedProfits_3004b86d-d2f4-dbde-8c3e-fd033e2fd9f9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_4e0ea51c-d09a-0164-9f15-a1d8d4927a87" xlink:type="locator" />
    <link:calculationArc order="18" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_1bd0bd4e-4a6f-b052-029c-0ecb0c520251" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_4e0ea51c-d09a-0164-9f15-a1d8d4927a87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_9743d583-dfae-6ae9-f133-a1e331df792c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6d89f221-3ede-36b2-fcad-4a4ce1606f6a" 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_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6d89f221-3ede-36b2-fcad-4a4ce1606f6a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_80abba07-181c-6ed2-349d-9d7dfc078eab" 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_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_80abba07-181c-6ed2-349d-9d7dfc078eab" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_2e493320-ebb4-7df2-c1f0-2dc8298386c7" 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_28655e34-499f-b7bf-c54f-5de0990d0c65" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_2e493320-ebb4-7df2-c1f0-2dc8298386c7" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_4d7615b5-9ab5-8e33-2d33-f406eee209fc" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_4d7615b5-9ab5-8e33-2d33-f406eee209fc" xlink:to="loc_us-gaap_NetIncomeLoss_a10eea14-f4db-3125-d183-77bb54500e95" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_f5ae002e-8316-7bc0-1b41-6cd171b53db3" 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_a10eea14-f4db-3125-d183-77bb54500e95" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_f5ae002e-8316-7bc0-1b41-6cd171b53db3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_8aa68cfb-2df7-9a23-d1ed-4fe33385b4a2" 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_a10eea14-f4db-3125-d183-77bb54500e95" xlink:to="loc_us-gaap_ProfitLoss_8aa68cfb-2df7-9a23-d1ed-4fe33385b4a2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8aa68cfb-2df7-9a23-d1ed-4fe33385b4a2" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_c5398800-6e68-ed86-a47c-16106e0730c2" 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_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_c5398800-6e68-ed86-a47c-16106e0730c2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_5c890570-5904-7978-36d8-35b96dcf45ab" 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_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:to="loc_us-gaap_OperatingIncomeLoss_5c890570-5904-7978-36d8-35b96dcf45ab" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_693c47dd-e6fa-9c85-6a65-7baa26f76b5e" 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_5c890570-5904-7978-36d8-35b96dcf45ab" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_693c47dd-e6fa-9c85-6a65-7baa26f76b5e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_df00e688-c7aa-f044-9cba-c48e7c14e35b" 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_5c890570-5904-7978-36d8-35b96dcf45ab" xlink:to="loc_us-gaap_GrossProfit_df00e688-c7aa-f044-9cba-c48e7c14e35b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_1c65a201-fd8e-32d7-dad9-c6d1d5719594" 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_df00e688-c7aa-f044-9cba-c48e7c14e35b" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_1c65a201-fd8e-32d7-dad9-c6d1d5719594" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1c604cfe-da19-5194-72b6-98be0130cfb7" 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_df00e688-c7aa-f044-9cba-c48e7c14e35b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1c604cfe-da19-5194-72b6-98be0130cfb7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_a56b34b7-57ab-a07c-7f03-8366849a14f0" 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_4d8b6d19-6a54-06aa-2077-c10380bd20d1" xlink:to="loc_us-gaap_InterestExpense_a56b34b7-57ab-a07c-7f03-8366849a14f0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_97bbae57-7f84-4da9-acab-610e56204929" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8aa68cfb-2df7-9a23-d1ed-4fe33385b4a2" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_97bbae57-7f84-4da9-acab-610e56204929" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_63184a46-2bac-760c-5a30-fe8e316dca8f" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_4d7615b5-9ab5-8e33-2d33-f406eee209fc" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_63184a46-2bac-760c-5a30-fe8e316dca8f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_0e67d263-6e0f-cbd4-f553-6c8cebeb68d8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_0e67d263-6e0f-cbd4-f553-6c8cebeb68d8" xlink:to="loc_us-gaap_ProfitLoss_8aa68cfb-2df7-9a23-d1ed-4fe33385b4a2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_b087c8bb-e0f6-4c7f-883c-027f52d32745" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_0e67d263-6e0f-cbd4-f553-6c8cebeb68d8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_b087c8bb-e0f6-4c7f-883c-027f52d32745" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContracts" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsDetails" xlink:type="extended">
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_CostAndEarningsOfUncompletedContracts" xlink:label="loc_dxpe_CostAndEarningsOfUncompletedContracts_9A5B5788723254B6A29C31D7C1A7972D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_51CB605548F357F895AB7197879EE589" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_dxpe_CostAndEarningsOfUncompletedContracts_9A5B5788723254B6A29C31D7C1A7972D" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_51CB605548F357F895AB7197879EE589" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_EstimatedEarningsThereonOnUncompletedContracts" xlink:label="loc_dxpe_EstimatedEarningsThereonOnUncompletedContracts_2FD0BC2E744A5860B452B291E85C444B" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_dxpe_CostAndEarningsOfUncompletedContracts_9A5B5788723254B6A29C31D7C1A7972D" xlink:to="loc_dxpe_EstimatedEarningsThereonOnUncompletedContracts_2FD0BC2E744A5860B452B291E85C444B" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_ContractWithCustomerAssetNetCurrentExcludingContractWithCustomerLiabilityCurrentAndTranslationAdjustment" xlink:label="loc_dxpe_ContractWithCustomerAssetNetCurrentExcludingContractWithCustomerLiabilityCurrentAndTranslationAdjustment_9FB55C3C53085FDC8607B66A8C2D3F3B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_B405C05CFEC05FBB8D358A1C27A1704A" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_dxpe_ContractWithCustomerAssetNetCurrentExcludingContractWithCustomerLiabilityCurrentAndTranslationAdjustment_9FB55C3C53085FDC8607B66A8C2D3F3B" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_B405C05CFEC05FBB8D358A1C27A1704A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_869651387DA05D9EA6E60DABAECA9F9F" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_dxpe_ContractWithCustomerAssetNetCurrentExcludingContractWithCustomerLiabilityCurrentAndTranslationAdjustment_9FB55C3C53085FDC8607B66A8C2D3F3B" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_869651387DA05D9EA6E60DABAECA9F9F" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_BillingsInExcessOfCostCurrentTranslationAdjustment" xlink:label="loc_dxpe_BillingsInExcessOfCostCurrentTranslationAdjustment_01F6482759C85346BC223CD5171F7813" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_dxpe_ContractWithCustomerAssetNetCurrentExcludingContractWithCustomerLiabilityCurrentAndTranslationAdjustment_9FB55C3C53085FDC8607B66A8C2D3F3B" xlink:to="loc_dxpe_BillingsInExcessOfCostCurrentTranslationAdjustment_01F6482759C85346BC223CD5171F7813" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/EarningsPerShareData" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/EarningsPerShareDataDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_49017E76620855B1944DA40EE310D17E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_2E4F4DCFA2435313B1443168D3CDFFF9" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_49017E76620855B1944DA40EE310D17E" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_2E4F4DCFA2435313B1443168D3CDFFF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConvertiblePreferredDividendsNetOfTax" xlink:label="loc_us-gaap_ConvertiblePreferredDividendsNetOfTax_8F8024B7FB9E575EA0FA78EF1C41DF97" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_49017E76620855B1944DA40EE310D17E" xlink:to="loc_us-gaap_ConvertiblePreferredDividendsNetOfTax_8F8024B7FB9E575EA0FA78EF1C41DF97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_D9E94EC2184D542AAFF0C8B013ECA9E2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1E9580FB46DA5C76980B4028B0A9F0CB" 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_D9E94EC2184D542AAFF0C8B013ECA9E2" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_1E9580FB46DA5C76980B4028B0A9F0CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock_F6D09ACE960555D2AE62DE49DF7CE73F" 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_D9E94EC2184D542AAFF0C8B013ECA9E2" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock_F6D09ACE960555D2AE62DE49DF7CE73F" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/EarningsPerShareDataTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilities" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesQuantitativeInformationAboutLevel3Details" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesReconciliationOfBeginningAndEndingBalancesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/IncomeTaxesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/Inventories" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/InventoriesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_F2E65DF49A545F5DAE980E3489350F52" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaap_InventoryFinishedGoods_643535753ACA5670A9866BD78F55B128" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_F2E65DF49A545F5DAE980E3489350F52" xlink:to="loc_us-gaap_InventoryFinishedGoods_643535753ACA5670A9866BD78F55B128" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryWorkInProcess" xlink:label="loc_us-gaap_InventoryWorkInProcess_BE00FF62B4C856D69C492016F6769AD2" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_F2E65DF49A545F5DAE980E3489350F52" xlink:to="loc_us-gaap_InventoryWorkInProcess_BE00FF62B4C856D69C492016F6769AD2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryValuationReserves" xlink:label="loc_us-gaap_InventoryValuationReserves_97BDE660531F5C199621E26885E3250C" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_F2E65DF49A545F5DAE980E3489350F52" xlink:to="loc_us-gaap_InventoryValuationReserves_97BDE660531F5C199621E26885E3250C" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/InventoriesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/Leases" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesContractualObligationsRelatedToOperatingLeasesUnderAsc840Details" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_9B137D45C2335CC8883FDC4CFD400210" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_17DC42BAB42B59C794C53A8AAFEEB4BC" 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_9B137D45C2335CC8883FDC4CFD400210" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_17DC42BAB42B59C794C53A8AAFEEB4BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwoAndThree" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwoAndThree_F5D4FD3B583F587EA82BF68276254890" 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_9B137D45C2335CC8883FDC4CFD400210" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearTwoAndThree_F5D4FD3B583F587EA82BF68276254890" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFourAndFive" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFourAndFive_5C8D4F26A4F55260A25162079A7D72F7" 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_9B137D45C2335CC8883FDC4CFD400210" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInRollingYearFourAndFive_5C8D4F26A4F55260A25162079A7D72F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_C9A65FCA04B35ABE8C8E0F274C828C5F" 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_9B137D45C2335CC8883FDC4CFD400210" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_C9A65FCA04B35ABE8C8E0F274C828C5F" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesLeaseExpenseDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_d5a06061-b83d-0d55-b7d3-e1229681b86d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_ae5c8735-cccc-5c5f-b5a8-6bc37dbfd64d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_d5a06061-b83d-0d55-b7d3-e1229681b86d" xlink:to="loc_us-gaap_ShortTermLeaseCost_ae5c8735-cccc-5c5f-b5a8-6bc37dbfd64d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_f08a7953-47bc-6d58-e55f-aa8ab4131b72" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_d5a06061-b83d-0d55-b7d3-e1229681b86d" xlink:to="loc_us-gaap_OperatingLeaseCost_f08a7953-47bc-6d58-e55f-aa8ab4131b72" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesLeaseTermAndDiscountRateDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesMaturityOfLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_d0e3c4ab-df94-52c6-3761-ce2ed0f2f507" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_d0e3c4ab-df94-52c6-3761-ce2ed0f2f507" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_e0f20176-305e-e29f-ab09-584aea596901" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_e0f20176-305e-e29f-ab09-584aea596901" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_8e35e675-3955-0e95-1b9c-d08dd410962e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_8e35e675-3955-0e95-1b9c-d08dd410962e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_852d78fc-d4b9-e5fb-fd5a-9da7d3d49669" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_852d78fc-d4b9-e5fb-fd5a-9da7d3d49669" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_7a6864a2-d55e-24e7-17f1-75d5cad038ee" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_7a6864a2-d55e-24e7-17f1-75d5cad038ee" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_a8c7556a-9f4c-b4fb-2e42-b21cf84287a7" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_a8c7556a-9f4c-b4fb-2e42-b21cf84287a7" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesMaturityOfLeaseLiabilitiesDetailsCalc2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5B7D8AC698D3B28EA4514B48DF174493_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_5B7D8AC698D3B28EA4514B48DF174493_dba432e7-eec4-e0dc-718d-f46fe263fe47" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5B7D8AC698D3B28EA4514B48DF174493_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_5B7D8AC698D3B28EA4514B48DF174493_dba432e7-eec4-e0dc-718d-f46fe263fe47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_5B7D8AC698D3B28EA4514B48DF174493_41784c6f-4555-af92-3354-8f8701c77f60" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5B7D8AC698D3B28EA4514B48DF174493_4d26bd18-43c4-5981-04d4-83d0e9328a1d" xlink:to="loc_us-gaap_OperatingLeaseLiability_5B7D8AC698D3B28EA4514B48DF174493_41784c6f-4555-af92-3354-8f8701c77f60" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_41784c6f-4555-af92-3354-8f8701c77f60" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_09c9f846-159b-1776-fceb-d1cad0eb94ab" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_41784c6f-4555-af92-3354-8f8701c77f60" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_09c9f846-159b-1776-fceb-d1cad0eb94ab" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_7e28dff2-da63-21d2-137e-ce9d56cb1b6e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_41784c6f-4555-af92-3354-8f8701c77f60" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_7e28dff2-da63-21d2-137e-ce9d56cb1b6e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesSupplementalCashFlowInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LeasesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LongTermDebt" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_80dca0ba-44dc-8565-fb9b-c2edfc8c357d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_0d8925ae-714a-26e4-aa69-2d9eac65a5c6" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_80dca0ba-44dc-8565-fb9b-c2edfc8c357d" xlink:to="loc_us-gaap_LongTermDebtCurrent_0d8925ae-714a-26e4-aa69-2d9eac65a5c6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_fcfc6b17-bfc5-2ebc-3fc1-751aa446a572" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_80dca0ba-44dc-8565-fb9b-c2edfc8c357d" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_fcfc6b17-bfc5-2ebc-3fc1-751aa446a572" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.dxpe.com/role/LongTermDebtTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/RecentAccountingPronouncements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/RecentAccountingPronouncementsPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/SegmentReporting" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/SegmentReportingFinancialInformationOfCompanysSegmentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/SegmentReportingIdentifiableAssetsBySegmentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/SegmentReportingReconciliationOfOperatingIncomeToConsolidatedIncomeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/SegmentReportingTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/SubsequentEvents" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.dxpe.com/role/SummaryOfSignificantAccountingAndBusinessPolicies" xlink:type="extended" />
</link:linkbase>
