<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:9e51504d-446f-4acc-a0cd-acabcf214b8d,g:b70a877d-1690-4aed-9062-e2b85cb52ee3-->
<link:linkbase 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" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.cmc.com/role/CoverPage" xlink:type="simple" xlink:href="cmc-20200229.xsd#CoverPage"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CoverPage" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEARNINGSUNAUDITED" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFEARNINGSUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEARNINGSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_cc91beb4-9231-4cb9-a26d-2863b2f82269" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_5d741fc1-4a21-45a8-9e02-ca591a8cb5de" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_cc91beb4-9231-4cb9-a26d-2863b2f82269" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_5d741fc1-4a21-45a8-9e02-ca591a8cb5de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_ee8cd199-0852-4055-a83b-6ee8ca1c8739" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_cc91beb4-9231-4cb9-a26d-2863b2f82269" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_ee8cd199-0852-4055-a83b-6ee8ca1c8739" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_57823d4b-c35d-42ea-9ad1-fe7787d426d9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_ebde854d-0129-46e8-8ee6-a33e5a7afaa8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_57823d4b-c35d-42ea-9ad1-fe7787d426d9" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_ebde854d-0129-46e8-8ee6-a33e5a7afaa8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_3301fba7-19be-48b9-91e6-cd45a6d7f9bd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_57823d4b-c35d-42ea-9ad1-fe7787d426d9" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_3301fba7-19be-48b9-91e6-cd45a6d7f9bd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_3556255a-4718-4ff9-a8fb-0e07436298fc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostsAndExpenses_57823d4b-c35d-42ea-9ad1-fe7787d426d9" xlink:to="loc_us-gaap_InterestExpense_3556255a-4718-4ff9-a8fb-0e07436298fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_c7a3dcc2-d6ec-4f05-97fd-b793d994e391" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_621574a5-6d73-420d-a2ca-85c7b3de7ae6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_c7a3dcc2-d6ec-4f05-97fd-b793d994e391" xlink:to="loc_us-gaap_CostsAndExpenses_621574a5-6d73-420d-a2ca-85c7b3de7ae6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_e8b377f9-5a7b-44e9-83fa-bca3930eae48" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_c7a3dcc2-d6ec-4f05-97fd-b793d994e391" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_e8b377f9-5a7b-44e9-83fa-bca3930eae48" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_8e954278-319c-44d4-ab5a-7e6e802268e8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_dec2f202-c67b-47d3-8071-5e40bcd07a6b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8e954278-319c-44d4-ab5a-7e6e802268e8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_dec2f202-c67b-47d3-8071-5e40bcd07a6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_f2472daf-c941-4ca0-82a1-cc54f097e9c9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8e954278-319c-44d4-ab5a-7e6e802268e8" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_f2472daf-c941-4ca0-82a1-cc54f097e9c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_9a5f1eb4-eafb-4342-bbd8-b7fc73701e46" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_4c3ba0eb-1eef-4e17-84e7-14bc3007fc67" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_9a5f1eb4-eafb-4342-bbd8-b7fc73701e46" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_4c3ba0eb-1eef-4e17-84e7-14bc3007fc67" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_ac0afd2e-2236-4fb1-b987-a924f1b1128e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_9a5f1eb4-eafb-4342-bbd8-b7fc73701e46" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_ac0afd2e-2236-4fb1-b987-a924f1b1128e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_3bd09857-301a-400c-bc65-ba7dd49007ec" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_4130c813-3cb0-4353-89cb-3ae49323c814" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasic_3bd09857-301a-400c-bc65-ba7dd49007ec" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_4130c813-3cb0-4353-89cb-3ae49323c814" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_513b1731-b95e-428a-aaa9-1fcb8474ecbb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasic_3bd09857-301a-400c-bc65-ba7dd49007ec" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_513b1731-b95e-428a-aaa9-1fcb8474ecbb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_977fb18e-9083-44c6-9a7d-086e15672e7a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_ff97a625-cb97-4e04-bb7d-a0ee0e7c56a4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_977fb18e-9083-44c6-9a7d-086e15672e7a" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_ff97a625-cb97-4e04-bb7d-a0ee0e7c56a4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_d7f59220-34be-467c-b95f-4cf2535f359a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_977fb18e-9083-44c6-9a7d-086e15672e7a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_d7f59220-34be-467c-b95f-4cf2535f359a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSUNAUDITED" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_b95922b3-2c32-43f5-acd8-38887ceabdb7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_54331246-37f3-4d7e-a087-63ab98a94d2a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_b95922b3-2c32-43f5-acd8-38887ceabdb7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_54331246-37f3-4d7e-a087-63ab98a94d2a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax_e2744ee4-6556-4f29-8daa-6129fe66a756" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_b95922b3-2c32-43f5-acd8-38887ceabdb7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax_e2744ee4-6556-4f29-8daa-6129fe66a756" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_1fa97ead-51b8-4bbc-9aa6-690683896f0e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_edd66393-db63-4b34-a2b6-4e7695537e73" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_1fa97ead-51b8-4bbc-9aa6-690683896f0e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_edd66393-db63-4b34-a2b6-4e7695537e73" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_b3ddaf9b-29b8-4448-b334-910e72d1a52f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_1fa97ead-51b8-4bbc-9aa6-690683896f0e" xlink:to="loc_us-gaap_NetIncomeLoss_b3ddaf9b-29b8-4448-b334-910e72d1a52f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_7772297b-9a26-464f-897a-e928924d7450" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_2887d51d-cae1-469a-a3d5-d3871f12980a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_7772297b-9a26-464f-897a-e928924d7450" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_2887d51d-cae1-469a-a3d5-d3871f12980a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_835fb521-2db9-49ec-8f68-a452eb7e6070" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_7772297b-9a26-464f-897a-e928924d7450" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax_835fb521-2db9-49ec-8f68-a452eb7e6070" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_b5d6ea05-90f6-4087-a073-38cdfe6775d9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_388d8844-d736-4d17-a8be-ad2c8d977092" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_b5d6ea05-90f6-4087-a073-38cdfe6775d9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_388d8844-d736-4d17-a8be-ad2c8d977092" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_fe223722-2ee6-474d-b8bc-d809f0321fce" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_b5d6ea05-90f6-4087-a073-38cdfe6775d9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_fe223722-2ee6-474d-b8bc-d809f0321fce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a0b07150-7d1c-48d5-adef-91318e404610" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_e7a06e45-4201-4816-a032-f7a52d9e5162" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a0b07150-7d1c-48d5-adef-91318e404610" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_e7a06e45-4201-4816-a032-f7a52d9e5162" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_ab2b025a-4849-4de8-bd46-43e285c53754" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a0b07150-7d1c-48d5-adef-91318e404610" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_ab2b025a-4849-4de8-bd46-43e285c53754" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_c66c7fd4-25bc-432d-b9a5-f3f46942e462" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_a0b07150-7d1c-48d5-adef-91318e404610" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_c66c7fd4-25bc-432d-b9a5-f3f46942e462" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_fceec05b-79c8-44dc-9e47-da1d9b5863d3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableTradeCurrent_b30f816b-72ff-487e-83d3-dd427ec24a7f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableTradeCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_fceec05b-79c8-44dc-9e47-da1d9b5863d3" xlink:to="loc_us-gaap_AccountsPayableTradeCurrent_b30f816b-72ff-487e-83d3-dd427ec24a7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_57e32e77-da4b-4c99-af12-7a0adca576f6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_fceec05b-79c8-44dc-9e47-da1d9b5863d3" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_57e32e77-da4b-4c99-af12-7a0adca576f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_BusinessCombinationAcquiredUnfavorableContractBacklog_251a5e1d-7b89-48e5-b7ee-840f5eec977d" xlink:href="cmc-20200229.xsd#cmc_BusinessCombinationAcquiredUnfavorableContractBacklog"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_fceec05b-79c8-44dc-9e47-da1d9b5863d3" xlink:to="loc_cmc_BusinessCombinationAcquiredUnfavorableContractBacklog_251a5e1d-7b89-48e5-b7ee-840f5eec977d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_CurrentMaturitiesandShorttermBorrowings_203880cf-1823-4265-b1ca-64407d23c170" xlink:href="cmc-20200229.xsd#cmc_CurrentMaturitiesandShorttermBorrowings"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_fceec05b-79c8-44dc-9e47-da1d9b5863d3" xlink:to="loc_cmc_CurrentMaturitiesandShorttermBorrowings_203880cf-1823-4265-b1ca-64407d23c170" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_6bef46d4-2f03-44ec-bf09-3c208de50bd9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_1e9d61cc-b189-4e22-9f6e-158932bb0c4f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6bef46d4-2f03-44ec-bf09-3c208de50bd9" xlink:to="loc_us-gaap_LiabilitiesCurrent_1e9d61cc-b189-4e22-9f6e-158932bb0c4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_e5dcb801-7f2d-44f0-bac7-237ec3759833" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6bef46d4-2f03-44ec-bf09-3c208de50bd9" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_e5dcb801-7f2d-44f0-bac7-237ec3759833" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_64f42661-7f46-40ef-b309-65f0545ae995" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6bef46d4-2f03-44ec-bf09-3c208de50bd9" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_64f42661-7f46-40ef-b309-65f0545ae995" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_92ca4f75-94fe-4c78-b9c4-b07b7feb47c1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_6bef46d4-2f03-44ec-bf09-3c208de50bd9" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_92ca4f75-94fe-4c78-b9c4-b07b7feb47c1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1048a87c-2736-46dc-becd-3bea49cdbb7d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_daca8678-b15b-4b9e-827e-17fedd0e15a3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1048a87c-2736-46dc-becd-3bea49cdbb7d" xlink:to="loc_us-gaap_CommonStockValue_daca8678-b15b-4b9e-827e-17fedd0e15a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_0abf66b3-7477-437e-9d3f-d8b9aa2e49fd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1048a87c-2736-46dc-becd-3bea49cdbb7d" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_0abf66b3-7477-437e-9d3f-d8b9aa2e49fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_266cf0e8-3178-41ab-b829-135f98075eb3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1048a87c-2736-46dc-becd-3bea49cdbb7d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_266cf0e8-3178-41ab-b829-135f98075eb3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_1c226065-35ef-46f5-9b59-cbede6afac75" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1048a87c-2736-46dc-becd-3bea49cdbb7d" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_1c226065-35ef-46f5-9b59-cbede6afac75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_8d9aac3d-a4ab-49ac-8457-b4afdf7280a9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_1048a87c-2736-46dc-becd-3bea49cdbb7d" xlink:to="loc_us-gaap_TreasuryStockValue_8d9aac3d-a4ab-49ac-8457-b4afdf7280a9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4eea9053-c7bc-44b5-9fc2-a7fdd878db16" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_a4a0b3c5-7c16-4332-8ba7-0f5eda41b1e0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4eea9053-c7bc-44b5-9fc2-a7fdd878db16" xlink:to="loc_us-gaap_StockholdersEquity_a4a0b3c5-7c16-4332-8ba7-0f5eda41b1e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_cfa0c967-1b41-4be2-82e1-e1ae61167fe3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4eea9053-c7bc-44b5-9fc2-a7fdd878db16" xlink:to="loc_us-gaap_MinorityInterest_cfa0c967-1b41-4be2-82e1-e1ae61167fe3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_4aee73d5-e4f6-4965-bb54-f05475ad77f6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_e4b8722e-2a92-4911-9c33-c2ef78cd5e97" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsAndShortTermInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4aee73d5-e4f6-4965-bb54-f05475ad77f6" xlink:to="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_e4b8722e-2a92-4911-9c33-c2ef78cd5e97" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_6467b9f3-ca37-45ff-b6f3-865d1064ea43" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4aee73d5-e4f6-4965-bb54-f05475ad77f6" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_6467b9f3-ca37-45ff-b6f3-865d1064ea43" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_ea93543b-756d-41a8-a41f-e4469e0a0785" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4aee73d5-e4f6-4965-bb54-f05475ad77f6" xlink:to="loc_us-gaap_InventoryNet_ea93543b-756d-41a8-a41f-e4469e0a0785" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_93e63fcf-cdc4-4ae6-9aed-f4025341d1f8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_4aee73d5-e4f6-4965-bb54-f05475ad77f6" xlink:to="loc_us-gaap_OtherAssetsCurrent_93e63fcf-cdc4-4ae6-9aed-f4025341d1f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_097ccb0b-d2b6-49d8-8cea-267dfce6a7c6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_bdadef66-9ab9-4a88-b3be-8ed60ffabc7a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_097ccb0b-d2b6-49d8-8cea-267dfce6a7c6" xlink:to="loc_us-gaap_Liabilities_bdadef66-9ab9-4a88-b3be-8ed60ffabc7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_89f7d677-6ef7-42b4-8590-7bab15e7a81c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_097ccb0b-d2b6-49d8-8cea-267dfce6a7c6" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_89f7d677-6ef7-42b4-8590-7bab15e7a81c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_a7a2ccdc-5b79-4687-9d5c-dfda9e0c3b7b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_097ccb0b-d2b6-49d8-8cea-267dfce6a7c6" xlink:to="loc_us-gaap_CommitmentsAndContingencies_a7a2ccdc-5b79-4687-9d5c-dfda9e0c3b7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_1a6719b4-9739-495a-8348-50f31b05b2e5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_03a79207-851e-4b22-b92e-53482ccc3d2d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_1a6719b4-9739-495a-8348-50f31b05b2e5" xlink:to="loc_us-gaap_AssetsCurrent_03a79207-851e-4b22-b92e-53482ccc3d2d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_891b992a-967e-4f79-9d75-85b8a75b2cd7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_1a6719b4-9739-495a-8348-50f31b05b2e5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_891b992a-967e-4f79-9d75-85b8a75b2cd7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_4a1f1170-dd93-4333-a8c4-33af1fb9e0db" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_1a6719b4-9739-495a-8348-50f31b05b2e5" xlink:to="loc_us-gaap_Goodwill_4a1f1170-dd93-4333-a8c4-33af1fb9e0db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_cb4c31db-57f0-4a7b-8d49-a4a0f5a30f78" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_1a6719b4-9739-495a-8348-50f31b05b2e5" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_cb4c31db-57f0-4a7b-8d49-a4a0f5a30f78" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSUNAUDITEDParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_5e260ad4-fdd6-45c1-ae7f-588563b39426" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_5e260ad4-fdd6-45c1-ae7f-588563b39426" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_1c409438-9f55-401c-b98d-8ab116db3ace" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_1c409438-9f55-401c-b98d-8ab116db3ace" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_a7db88b0-d756-4607-a320-ca4aee29f6b7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_a7db88b0-d756-4607-a320-ca4aee29f6b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_RepaymentsUnderAccountsReceivableProgramsFinancingActivities_7ceb5e3d-1b42-41cd-8d88-d33ea1e80db3" xlink:href="cmc-20200229.xsd#cmc_RepaymentsUnderAccountsReceivableProgramsFinancingActivities"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:to="loc_cmc_RepaymentsUnderAccountsReceivableProgramsFinancingActivities_7ceb5e3d-1b42-41cd-8d88-d33ea1e80db3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_b0942e85-405c-43d7-8ef8-6ef4157e229f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_b0942e85-405c-43d7-8ef8-6ef4157e229f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings_9661734e-d0a3-42df-8048-50a8ea875fe3" xlink:href="cmc-20200229.xsd#cmc_ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:to="loc_cmc_ProceedsPaymentsfromIssuanceofSharesunderIncentiveandSharebasedCompensationPlansIncludingTaxWithholdings_9661734e-d0a3-42df-8048-50a8ea875fe3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_e7a93649-8673-4acc-acea-95aa8f263b98" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_de831fd8-bc5e-4fc3-bc23-beabf3c361ef" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_e7a93649-8673-4acc-acea-95aa8f263b98" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f264706-38aa-4112-87b7-e240f5b61cfa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_4d0f396e-d17e-468d-aecd-75cb1ddbfa9d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f264706-38aa-4112-87b7-e240f5b61cfa" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_4d0f396e-d17e-468d-aecd-75cb1ddbfa9d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_be7826cd-a2f9-4926-a56c-c3b02981f1c0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f264706-38aa-4112-87b7-e240f5b61cfa" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_be7826cd-a2f9-4926-a56c-c3b02981f1c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLifeInsurancePolicies_6ffa0600-e170-4f4d-abce-5f274b6a2c28" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromLifeInsurancePolicies"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f264706-38aa-4112-87b7-e240f5b61cfa" xlink:to="loc_us-gaap_ProceedsFromLifeInsurancePolicies_6ffa0600-e170-4f4d-abce-5f274b6a2c28" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_50bd8089-4c48-43d3-a8ed-7db24c3095e5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f264706-38aa-4112-87b7-e240f5b61cfa" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_50bd8089-4c48-43d3-a8ed-7db24c3095e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities_145c4b25-c609-4cc7-8501-9be6a2d8d3e5" xlink:href="cmc-20200229.xsd#cmc_IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f264706-38aa-4112-87b7-e240f5b61cfa" xlink:to="loc_cmc_IncreaseDecreaseinAccountsReceivablefromSecuritizationInvestingActivities_145c4b25-c609-4cc7-8501-9be6a2d8d3e5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_1f6a1a20-e8ac-4b7a-97cc-85d7290bca5d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_1f6a1a20-e8ac-4b7a-97cc-85d7290bca5d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_AmortizationAcquiredUnfavorableContractBacklog_fd78bcdf-c586-4bb5-b39a-92bda5892ca5" xlink:href="cmc-20200229.xsd#cmc_AmortizationAcquiredUnfavorableContractBacklog"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_cmc_AmortizationAcquiredUnfavorableContractBacklog_fd78bcdf-c586-4bb5-b39a-92bda5892ca5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_a018ec28-1f6e-458a-873a-302525913f72" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_a018ec28-1f6e-458a-873a-302525913f72" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_35c8d86a-0928-4e44-a2a5-86ce3e0ca14f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_35c8d86a-0928-4e44-a2a5-86ce3e0ca14f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_12e8660f-2c73-4879-948a-4ebe78481436" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_NetIncomeLoss_12e8660f-2c73-4879-948a-4ebe78481436" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_62a8ef86-e3d1-4fe3-8437-bad75d03840d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_62a8ef86-e3d1-4fe3-8437-bad75d03840d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_f7f832d3-6bb0-4e47-9e3b-917d08ac0ebd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_f7f832d3-6bb0-4e47-9e3b-917d08ac0ebd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivableFromSecuritization_c008571f-91fa-4ae9-8001-4db13e6f7af5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivableFromSecuritization"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivableFromSecuritization_c008571f-91fa-4ae9-8001-4db13e6f7af5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_5ad5336c-4618-4c95-bb90-d8018a26fc03" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_da16191a-ea22-420e-9056-841079bff72d" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_5ad5336c-4618-4c95-bb90-d8018a26fc03" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ca7785a2-4313-4e8f-823a-019ec00f41cb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f302776b-2bc4-45bd-b71b-a52d9167c320" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ca7785a2-4313-4e8f-823a-019ec00f41cb" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_f302776b-2bc4-45bd-b71b-a52d9167c320" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d27282d9-01ce-4994-a496-be64beb092f7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ca7785a2-4313-4e8f-823a-019ec00f41cb" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d27282d9-01ce-4994-a496-be64beb092f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a8d685f6-380d-44dd-958b-abf10259668d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ca7785a2-4313-4e8f-823a-019ec00f41cb" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a8d685f6-380d-44dd-958b-abf10259668d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_4a046c0b-888b-4878-a3d1-4d6925752893" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_ca7785a2-4313-4e8f-823a-019ec00f41cb" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_4a046c0b-888b-4878-a3d1-4d6925752893" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITEDParenthetical" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITEDParenthetical"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUNAUDITEDParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6ab1df8c-cae6-41c3-a8a2-c764619ebb9f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_deed7f73-1b59-425d-8484-e6fbce596aec" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsAndShortTermInvestments"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6ab1df8c-cae6-41c3-a8a2-c764619ebb9f" xlink:to="loc_us-gaap_CashCashEquivalentsAndShortTermInvestments_deed7f73-1b59-425d-8484-e6fbce596aec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_56f2d3c8-2d6a-43e8-b878-2c8ad82c8057" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_6ab1df8c-cae6-41c3-a8a2-c764619ebb9f" xlink:to="loc_us-gaap_RestrictedCash_56f2d3c8-2d6a-43e8-b878-2c8ad82c8057" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUNAUDITED" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUNAUDITED"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUNAUDITED" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUNAUDITEDParenthetical" xlink:type="simple" xlink:href="cmc-20200229.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUNAUDITEDParenthetical"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUNAUDITEDParenthetical" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/ACCOUNTINGPOLICIES" xlink:type="simple" xlink:href="cmc-20200229.xsd#ACCOUNTINGPOLICIES"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/ACCOUNTINGPOLICIES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/ACCOUNTINGPOLICIESPolicies" xlink:type="simple" xlink:href="cmc-20200229.xsd#ACCOUNTINGPOLICIESPolicies"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/ACCOUNTINGPOLICIESPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/ACCOUNTINGPOLICIESRecentlyAdoptedAccountingPronouncementsDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#ACCOUNTINGPOLICIESRecentlyAdoptedAccountingPronouncementsDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/ACCOUNTINGPOLICIESRecentlyAdoptedAccountingPronouncementsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CHANGESINBUSINESS" xlink:type="simple" xlink:href="cmc-20200229.xsd#CHANGESINBUSINESS"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CHANGESINBUSINESS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CHANGESINBUSINESSTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#CHANGESINBUSINESSTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CHANGESINBUSINESSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CHANGESINBUSINESSDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#CHANGESINBUSINESSDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CHANGESINBUSINESSDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS" xlink:type="simple" xlink:href="cmc-20200229.xsd#ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSAOCIbyComponentsDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSAOCIbyComponentsDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSAOCIbyComponentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3345c95a-238d-4104-b8f1-dd25d9a054a4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_38affe03-dd4a-49e9-86ce-b28091728f67" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3345c95a-238d-4104-b8f1-dd25d9a054a4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_38affe03-dd4a-49e9-86ce-b28091728f67" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_7efad229-2416-4dd6-a21e-594dd9f959c8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3345c95a-238d-4104-b8f1-dd25d9a054a4" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_7efad229-2416-4dd6-a21e-594dd9f959c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_0298060a-ced4-4d29-8612-b7858d6a0aae" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3345c95a-238d-4104-b8f1-dd25d9a054a4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_0298060a-ced4-4d29-8612-b7858d6a0aae" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/REVENUERECOGNITION" xlink:type="simple" xlink:href="cmc-20200229.xsd#REVENUERECOGNITION"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/REVENUERECOGNITION" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/REVENUERECOGNITIONTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#REVENUERECOGNITIONTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/REVENUERECOGNITIONTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/REVENUERECOGNITIONRevenueRecognitionMethodDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#REVENUERECOGNITIONRevenueRecognitionMethodDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/REVENUERECOGNITIONRevenueRecognitionMethodDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/REVENUERECOGNITIONContractAssetsandContractLiabilitiesDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#REVENUERECOGNITIONContractAssetsandContractLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/REVENUERECOGNITIONContractAssetsandContractLiabilitiesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/REVENUERECOGNITIONRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#REVENUERECOGNITIONRemainingPerformanceObligationsDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/REVENUERECOGNITIONRemainingPerformanceObligationsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/REVENUERECOGNITIONDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#REVENUERECOGNITIONDisaggregationofRevenueDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/REVENUERECOGNITIONDisaggregationofRevenueDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/INVENTORIESNET" xlink:type="simple" xlink:href="cmc-20200229.xsd#INVENTORIESNET"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/INVENTORIESNET" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/INVENTORIESNETNarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#INVENTORIESNETNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/INVENTORIESNETNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLES" xlink:type="simple" xlink:href="cmc-20200229.xsd#GOODWILLANDOTHERINTANGIBLES"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLESTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#GOODWILLANDOTHERINTANGIBLESTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLESNarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#GOODWILLANDOTHERINTANGIBLESNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLESNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLESChangesintheCarryingAmountofGoodwillDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#GOODWILLANDOTHERINTANGIBLESChangesintheCarryingAmountofGoodwillDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/GOODWILLANDOTHERINTANGIBLESChangesintheCarryingAmountofGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_b5b5799f-8b08-4461-923b-d0a8d5df4200" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_485931a1-d8bc-4c77-b783-1d90d353ed3a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Goodwill_b5b5799f-8b08-4461-923b-d0a8d5df4200" xlink:to="loc_us-gaap_GoodwillGross_485931a1-d8bc-4c77-b783-1d90d353ed3a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_8c2a5005-8a6e-482a-bcaa-f3d4ad568c4b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Goodwill_b5b5799f-8b08-4461-923b-d0a8d5df4200" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_8c2a5005-8a6e-482a-bcaa-f3d4ad568c4b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASES" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASES"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESBalanceSheetComponentsDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESBalanceSheetComponentsDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESBalanceSheetComponentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_44fc9bbc-00c1-495a-ba22-e4bcecc6bd49" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_3afaae71-9532-4ea3-b3c7-a8529469937d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiability_44fc9bbc-00c1-495a-ba22-e4bcecc6bd49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_3afaae71-9532-4ea3-b3c7-a8529469937d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_36e7abbb-f9a4-4433-aad6-cdc3fe3f1a25" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiability_44fc9bbc-00c1-495a-ba22-e4bcecc6bd49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_36e7abbb-f9a4-4433-aad6-cdc3fe3f1a25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_5ee085df-d5ba-4133-a463-a8e0709f2a8b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_336b3edc-4126-4f3a-be4b-31be1645621c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_5ee085df-d5ba-4133-a463-a8e0709f2a8b" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_336b3edc-4126-4f3a-be4b-31be1645621c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_37a34e54-599e-4d9a-a555-23b470bdfbe8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_5ee085df-d5ba-4133-a463-a8e0709f2a8b" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_37a34e54-599e-4d9a-a555-23b470bdfbe8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_LeaseLiability_4e8f0ebf-2eb3-430d-bbe3-65856cccea03" xlink:href="cmc-20200229.xsd#cmc_LeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_44e63698-c5cf-4f5f-9275-fe02a9bc4058" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_LeaseLiability_4e8f0ebf-2eb3-430d-bbe3-65856cccea03" xlink:to="loc_us-gaap_OperatingLeaseLiability_44e63698-c5cf-4f5f-9275-fe02a9bc4058" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_85dd80c8-ac4b-424b-a5d4-f5a567195569" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_LeaseLiability_4e8f0ebf-2eb3-430d-bbe3-65856cccea03" xlink:to="loc_us-gaap_FinanceLeaseLiability_85dd80c8-ac4b-424b-a5d4-f5a567195569" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_RightofUseAsset_b7d4e706-7762-402b-8a66-217f64426dd7" xlink:href="cmc-20200229.xsd#cmc_RightofUseAsset"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_c09fee6e-5d42-4c83-9521-d486b4f0e6fa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_RightofUseAsset_b7d4e706-7762-402b-8a66-217f64426dd7" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_c09fee6e-5d42-4c83-9521-d486b4f0e6fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_7c63fe5d-87a1-42b1-9640-dd41606e475b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_RightofUseAsset_b7d4e706-7762-402b-8a66-217f64426dd7" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_7c63fe5d-87a1-42b1-9640-dd41606e475b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESLeaseCostDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESLeaseCostDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESLeaseCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_228a4a66-c3dd-4a47-ad96-76b1b0dc76fc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_c73d5938-3602-4ce2-bf87-73973ccd7710" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_228a4a66-c3dd-4a47-ad96-76b1b0dc76fc" xlink:to="loc_us-gaap_OperatingLeaseCost_c73d5938-3602-4ce2-bf87-73973ccd7710" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_FinanceLeaseCost_83eef3bb-6b9b-4b18-a27e-ba55c9293b0a" xlink:href="cmc-20200229.xsd#cmc_FinanceLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_228a4a66-c3dd-4a47-ad96-76b1b0dc76fc" xlink:to="loc_cmc_FinanceLeaseCost_83eef3bb-6b9b-4b18-a27e-ba55c9293b0a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_7f8e89a1-9f5b-4b6c-b80b-e7a51cf973a0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_228a4a66-c3dd-4a47-ad96-76b1b0dc76fc" xlink:to="loc_us-gaap_VariableLeaseCost_7f8e89a1-9f5b-4b6c-b80b-e7a51cf973a0" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESWeightedAverageLeaseTermsandDiscountRatesDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESWeightedAverageLeaseTermsandDiscountRatesDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESWeightedAverageLeaseTermsandDiscountRatesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESCashFlowandOtherInformationRelatedtoLeasesDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESCashFlowandOtherInformationRelatedtoLeasesDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESCashFlowandOtherInformationRelatedtoLeasesDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESMaturityofLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESMaturityofLeaseLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESMaturityofLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_91c58887-6983-4c32-94e7-1d01da176c8f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_56d8df58-04ca-470e-bb98-027dd83a5212" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_91c58887-6983-4c32-94e7-1d01da176c8f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_56d8df58-04ca-470e-bb98-027dd83a5212" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_51c9d2af-e847-4732-96af-80dff726b9de" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_91c58887-6983-4c32-94e7-1d01da176c8f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_51c9d2af-e847-4732-96af-80dff726b9de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_b118f7f5-6cc4-480f-a5e9-f5b23a1ad9e2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_91c58887-6983-4c32-94e7-1d01da176c8f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_b118f7f5-6cc4-480f-a5e9-f5b23a1ad9e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_f6334fee-f9e5-42ba-8c03-fb9688bb1087" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_91c58887-6983-4c32-94e7-1d01da176c8f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_f6334fee-f9e5-42ba-8c03-fb9688bb1087" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_64eaf7d8-ec1a-449e-919d-19088c186c01" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_91c58887-6983-4c32-94e7-1d01da176c8f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_64eaf7d8-ec1a-449e-919d-19088c186c01" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_277edc4c-b41c-49d5-9dba-b5a1fafe1a86" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_91c58887-6983-4c32-94e7-1d01da176c8f" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_277edc4c-b41c-49d5-9dba-b5a1fafe1a86" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_e197b267-8d5f-4260-99d8-59a1ea2d1bcc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_f7d74d5e-acef-45ae-87d4-84669c8a9355" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_e197b267-8d5f-4260-99d8-59a1ea2d1bcc" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_f7d74d5e-acef-45ae-87d4-84669c8a9355" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_e2823341-2c44-43d7-a66c-f627c44e969d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_e197b267-8d5f-4260-99d8-59a1ea2d1bcc" xlink:to="loc_us-gaap_OperatingLeaseLiability_e2823341-2c44-43d7-a66c-f627c44e969d" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESMaturityofLeaseLiabilitiesDetails_1" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESMaturityofLeaseLiabilitiesDetails_1"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESMaturityofLeaseLiabilitiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_ffdee563-c0f0-4112-9990-2270ae4b27b7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_1c97e7e6-2b41-49a0-bc8d-de741005913e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_ffdee563-c0f0-4112-9990-2270ae4b27b7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_1c97e7e6-2b41-49a0-bc8d-de741005913e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_93938047-5e07-4e8e-b72f-35214ecad7fe" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_ffdee563-c0f0-4112-9990-2270ae4b27b7" xlink:to="loc_us-gaap_FinanceLeaseLiability_93938047-5e07-4e8e-b72f-35214ecad7fe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_23e34636-f654-4c51-923b-e76b484c7eb7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_56be18f1-e728-4bc0-a84f-a71dcdbddf7b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_23e34636-f654-4c51-923b-e76b484c7eb7" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_56be18f1-e728-4bc0-a84f-a71dcdbddf7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_58573ff2-2002-4ce0-8d70-05c0f76ec2d0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_23e34636-f654-4c51-923b-e76b484c7eb7" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_58573ff2-2002-4ce0-8d70-05c0f76ec2d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_a9821e07-62cd-4e32-8270-7807dc607722" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_23e34636-f654-4c51-923b-e76b484c7eb7" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_a9821e07-62cd-4e32-8270-7807dc607722" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_492429e9-56a4-482d-a4bb-f39d7a993fea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_23e34636-f654-4c51-923b-e76b484c7eb7" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_492429e9-56a4-482d-a4bb-f39d7a993fea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_74bfbe5d-324c-401a-9713-4589a08d23fc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_23e34636-f654-4c51-923b-e76b484c7eb7" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_74bfbe5d-324c-401a-9713-4589a08d23fc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_f364b351-f4ba-48e5-bffd-1ca778e8b99e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_23e34636-f654-4c51-923b-e76b484c7eb7" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_f364b351-f4ba-48e5-bffd-1ca778e8b99e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/LEASESFutureLeaseObligationsPriortoAdoptionofASU201602Details" xlink:type="simple" xlink:href="cmc-20200229.xsd#LEASESFutureLeaseObligationsPriortoAdoptionofASU201602Details"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/LEASESFutureLeaseObligationsPriortoAdoptionofASU201602Details" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e71b6e1f-5ac9-4ba0-96f9-fa6410a74aba" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_503dca1d-b7d1-46fd-ae86-e5276faf08c8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e71b6e1f-5ac9-4ba0-96f9-fa6410a74aba" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_503dca1d-b7d1-46fd-ae86-e5276faf08c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_82cbd99b-da6c-4a12-92a4-440b32299a2d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e71b6e1f-5ac9-4ba0-96f9-fa6410a74aba" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_82cbd99b-da6c-4a12-92a4-440b32299a2d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_533fdeba-9383-4e0a-98f3-8fe1753171b9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e71b6e1f-5ac9-4ba0-96f9-fa6410a74aba" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_533fdeba-9383-4e0a-98f3-8fe1753171b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_ec4a8001-47d6-4aa4-b030-ea23d7d4a9db" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e71b6e1f-5ac9-4ba0-96f9-fa6410a74aba" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_ec4a8001-47d6-4aa4-b030-ea23d7d4a9db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_e9af940b-38dd-4c5a-bf92-d197cbb34dbb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e71b6e1f-5ac9-4ba0-96f9-fa6410a74aba" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_e9af940b-38dd-4c5a-bf92-d197cbb34dbb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_794a7fac-633c-4aaa-95c6-966bd98b687f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_e71b6e1f-5ac9-4ba0-96f9-fa6410a74aba" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_794a7fac-633c-4aaa-95c6-966bd98b687f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_28a442dd-9981-4c17-ad65-629ed8f1aba2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_f6827183-d221-4851-b00f-698f54b0f756" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_28a442dd-9981-4c17-ad65-629ed8f1aba2" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_f6827183-d221-4851-b00f-698f54b0f756" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_89256956-c107-46d9-a286-1d8d9c51bea1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_28a442dd-9981-4c17-ad65-629ed8f1aba2" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_89256956-c107-46d9-a286-1d8d9c51bea1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_72f5f91e-13b2-4e0c-8cd8-5137523a9f85" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_28a442dd-9981-4c17-ad65-629ed8f1aba2" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_72f5f91e-13b2-4e0c-8cd8-5137523a9f85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_416cdc1d-3dcf-46d2-8bfe-99c12abeab3c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_28a442dd-9981-4c17-ad65-629ed8f1aba2" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_416cdc1d-3dcf-46d2-8bfe-99c12abeab3c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_d3d69551-c8fe-47d0-9abd-2d3e211f7f62" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_28a442dd-9981-4c17-ad65-629ed8f1aba2" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_d3d69551-c8fe-47d0-9abd-2d3e211f7f62" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_2ae13c25-79ad-465a-b28e-bd6b19edadbc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_28a442dd-9981-4c17-ad65-629ed8f1aba2" xlink:to="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_2ae13c25-79ad-465a-b28e-bd6b19edadbc" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CREDITARRANGEMENTS" xlink:type="simple" xlink:href="cmc-20200229.xsd#CREDITARRANGEMENTS"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CREDITARRANGEMENTS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#CREDITARRANGEMENTSTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CREDITARRANGEMENTSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSLongtermDebtIncludingtheDeferredGainfromtheTerminationoftheInterestRateSwapsDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#CREDITARRANGEMENTSLongtermDebtIncludingtheDeferredGainfromtheTerminationoftheInterestRateSwapsDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CREDITARRANGEMENTSLongtermDebtIncludingtheDeferredGainfromtheTerminationoftheInterestRateSwapsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cmc_LongtermDebtandCapitalLeaseObligationsNet_3b9b30a7-45b9-4d1b-ae6f-05c7574c4b64" xlink:href="cmc-20200229.xsd#cmc_LongtermDebtandCapitalLeaseObligationsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_0ca7f310-b6a7-495d-8227-7dfe1862d2b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_LongtermDebtandCapitalLeaseObligationsNet_3b9b30a7-45b9-4d1b-ae6f-05c7574c4b64" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_0ca7f310-b6a7-495d-8227-7dfe1862d2b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_27a6f2aa-8ef0-4894-9091-537eb206297a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_LongtermDebtandCapitalLeaseObligationsNet_3b9b30a7-45b9-4d1b-ae6f-05c7574c4b64" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_27a6f2aa-8ef0-4894-9091-537eb206297a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_CurrentMaturitiesandShorttermBorrowings_17f6545a-0943-4353-964a-854941164004" xlink:href="cmc-20200229.xsd#cmc_CurrentMaturitiesandShorttermBorrowings"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_ab6cfced-3eaa-45bf-aa5f-56237e49f4fb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_CurrentMaturitiesandShorttermBorrowings_17f6545a-0943-4353-964a-854941164004" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_ab6cfced-3eaa-45bf-aa5f-56237e49f4fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_e0eca41f-77e3-481c-b01e-93715bd2e100" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_CurrentMaturitiesandShorttermBorrowings_17f6545a-0943-4353-964a-854941164004" xlink:to="loc_us-gaap_ShortTermBorrowings_e0eca41f-77e3-481c-b01e-93715bd2e100" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSLongtermDebtIncludingtheDeferredGainfromtheTerminationoftheInterestRateSwapsDetails_1" xlink:type="simple" xlink:href="cmc-20200229.xsd#CREDITARRANGEMENTSLongtermDebtIncludingtheDeferredGainfromtheTerminationoftheInterestRateSwapsDetails_1"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CREDITARRANGEMENTSLongtermDebtIncludingtheDeferredGainfromtheTerminationoftheInterestRateSwapsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cmc_LongtermDebtandCapitalLeaseObligationsNet_f0708d7f-660b-4a6f-ab74-b18826dede3a" xlink:href="cmc-20200229.xsd#cmc_LongtermDebtandCapitalLeaseObligationsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_d4e909db-3aab-4592-a10f-8e611f087780" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_LongtermDebtandCapitalLeaseObligationsNet_f0708d7f-660b-4a6f-ab74-b18826dede3a" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_d4e909db-3aab-4592-a10f-8e611f087780" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_8a2b382d-494c-4429-90c6-d69f5aeb9920" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_LongtermDebtandCapitalLeaseObligationsNet_f0708d7f-660b-4a6f-ab74-b18826dede3a" xlink:to="loc_us-gaap_ShortTermBorrowings_8a2b382d-494c-4429-90c6-d69f5aeb9920" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_dc6fe242-33e1-464e-bfc4-a07c5f8c971a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_cmc_LongtermDebtandCapitalLeaseObligationsNet_f0708d7f-660b-4a6f-ab74-b18826dede3a" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_dc6fe242-33e1-464e-bfc4-a07c5f8c971a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/CREDITARRANGEMENTSNarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#CREDITARRANGEMENTSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/CREDITARRANGEMENTSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/DERIVATIVES" xlink:type="simple" xlink:href="cmc-20200229.xsd#DERIVATIVES"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/DERIVATIVES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/DERIVATIVESTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#DERIVATIVESTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/DERIVATIVESTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/DERIVATIVESNarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#DERIVATIVESNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/DERIVATIVESNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/DERIVATIVESCommodityContractCommitmentsDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#DERIVATIVESCommodityContractCommitmentsDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/DERIVATIVESCommodityContractCommitmentsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/DERIVATIVESDerivativesNotDesignatedasHedgingInstrumentsDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#DERIVATIVESDerivativesNotDesignatedasHedgingInstrumentsDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/DERIVATIVESDerivativesNotDesignatedasHedgingInstrumentsDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/FAIRVALUE" xlink:type="simple" xlink:href="cmc-20200229.xsd#FAIRVALUE"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/FAIRVALUE" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/FAIRVALUETables" xlink:type="simple" xlink:href="cmc-20200229.xsd#FAIRVALUETables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/FAIRVALUETables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/FAIRVALUENarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#FAIRVALUENarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/FAIRVALUENarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/FAIRVALUEFinancialAssetsandFinancialLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#FAIRVALUEFinancialAssetsandFinancialLiabilitiesMeasuredatFairValueonRecurringBasisDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/FAIRVALUEFinancialAssetsandFinancialLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/FAIRVALUEFinancialAssetsandLiabilitiesNotRequiredtoBeMeasuredatFairValueDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#FAIRVALUEFinancialAssetsandLiabilitiesNotRequiredtoBeMeasuredatFairValueDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/FAIRVALUEFinancialAssetsandLiabilitiesNotRequiredtoBeMeasuredatFairValueDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANS" xlink:type="simple" xlink:href="cmc-20200229.xsd#STOCKBASEDCOMPENSATIONPLANS"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#STOCKBASEDCOMPENSATIONPLANSTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSNarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#STOCKBASEDCOMPENSATIONPLANSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/STOCKBASEDCOMPENSATIONPLANSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARE" xlink:type="simple" xlink:href="cmc-20200229.xsd#STOCKHOLDERSEQUITYANDEARNINGSPERSHARE"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARE" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARETables" xlink:type="simple" xlink:href="cmc-20200229.xsd#STOCKHOLDERSEQUITYANDEARNINGSPERSHARETables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARETables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARENarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#STOCKHOLDERSEQUITYANDEARNINGSPERSHARENarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARENarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARECalculationsoftheBasicandDilutedEarningsPerShareDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#STOCKHOLDERSEQUITYANDEARNINGSPERSHARECalculationsoftheBasicandDilutedEarningsPerShareDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/STOCKHOLDERSEQUITYANDEARNINGSPERSHARECalculationsoftheBasicandDilutedEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1a6c955f-58a1-4458-b2fe-005a147c9c0e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_a9f3449f-f973-4b8d-9a3f-776d89f3ce7f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1a6c955f-58a1-4458-b2fe-005a147c9c0e" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_a9f3449f-f973-4b8d-9a3f-776d89f3ce7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_65853292-f1be-46f8-b634-bd82994e20e5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1a6c955f-58a1-4458-b2fe-005a147c9c0e" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_65853292-f1be-46f8-b634-bd82994e20e5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/COMMITMENTSANDCONTINGENCIES" xlink:type="simple" xlink:href="cmc-20200229.xsd#COMMITMENTSANDCONTINGENCIES"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/COMMITMENTSANDCONTINGENCIES" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#COMMITMENTSANDCONTINGENCIESNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/BUSINESSSEGMENTS" xlink:type="simple" xlink:href="cmc-20200229.xsd#BUSINESSSEGMENTS"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/BUSINESSSEGMENTS" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/BUSINESSSEGMENTSTables" xlink:type="simple" xlink:href="cmc-20200229.xsd#BUSINESSSEGMENTSTables"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/BUSINESSSEGMENTSTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/BUSINESSSEGMENTSNarrativeDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#BUSINESSSEGMENTSNarrativeDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/BUSINESSSEGMENTSNarrativeDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/BUSINESSSEGMENTSSummaryofCertainFinancialInformationfromContinuingOperationsbyReportableSegmentDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#BUSINESSSEGMENTSSummaryofCertainFinancialInformationfromContinuingOperationsbyReportableSegmentDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/BUSINESSSEGMENTSSummaryofCertainFinancialInformationfromContinuingOperationsbyReportableSegmentDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.cmc.com/role/BUSINESSSEGMENTSReconciliationsofEarningsfromContinuingOperationstoAdjustedOperatingProfitDetails" xlink:type="simple" xlink:href="cmc-20200229.xsd#BUSINESSSEGMENTSReconciliationsofEarningsfromContinuingOperationstoAdjustedOperatingProfitDetails"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/BUSINESSSEGMENTSReconciliationsofEarningsfromContinuingOperationstoAdjustedOperatingProfitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_be1833e3-f04f-4ecf-8055-cdf47a60784e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_a24b9845-5845-4401-8864-6f7747828c8f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_be1833e3-f04f-4ecf-8055-cdf47a60784e" xlink:to="loc_us-gaap_InterestExpense_a24b9845-5845-4401-8864-6f7747828c8f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_bfbbb219-f5fc-415a-bde2-0cdc4b6a6289" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_be1833e3-f04f-4ecf-8055-cdf47a60784e" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_bfbbb219-f5fc-415a-bde2-0cdc4b6a6289" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_DepreciationAmortizationAndAssetImpairmentCharges_384f87a0-a500-40bd-b5b2-c5eb6ee5295f" xlink:href="cmc-20200229.xsd#cmc_DepreciationAmortizationAndAssetImpairmentCharges"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_be1833e3-f04f-4ecf-8055-cdf47a60784e" xlink:to="loc_cmc_DepreciationAmortizationAndAssetImpairmentCharges_384f87a0-a500-40bd-b5b2-c5eb6ee5295f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_AmortizationAcquiredUnfavorableContractBacklog_2f30e338-66d8-40dc-949b-37223230ab9e" xlink:href="cmc-20200229.xsd#cmc_AmortizationAcquiredUnfavorableContractBacklog"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_be1833e3-f04f-4ecf-8055-cdf47a60784e" xlink:to="loc_cmc_AmortizationAcquiredUnfavorableContractBacklog_2f30e338-66d8-40dc-949b-37223230ab9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSecuritizationOfFinancialAssets_89520383-e2c7-4a4b-a97b-cf9f78d1fa77" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSecuritizationOfFinancialAssets"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_be1833e3-f04f-4ecf-8055-cdf47a60784e" xlink:to="loc_us-gaap_GainLossOnSecuritizationOfFinancialAssets_89520383-e2c7-4a4b-a97b-cf9f78d1fa77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_cmc_AdjustedOperatingProfitLossFromContinuingOperation_277c3e63-8344-4075-98f3-c2b538ef3b3c" xlink:href="cmc-20200229.xsd#cmc_AdjustedOperatingProfitLossFromContinuingOperation"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_be1833e3-f04f-4ecf-8055-cdf47a60784e" xlink:to="loc_cmc_AdjustedOperatingProfitLossFromContinuingOperation_277c3e63-8344-4075-98f3-c2b538ef3b3c" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.cmc.com/role/REVENUERECOGNITIONRemainingPerformanceObligationsDetailsDefault" xlink:type="simple" xlink:href="cmc-20200229.xsd#REVENUERECOGNITIONRemainingPerformanceObligationsDetailsDefault"/>
  <link:calculationLink xlink:role="http://www.cmc.com/role/REVENUERECOGNITIONRemainingPerformanceObligationsDetailsDefault" xlink:type="extended"/>
</link:linkbase>
