<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.mistrasgroup.com/role/AccountsReceivableNet" xlink:href="mg-20160229.xsd#AccountsReceivableNet" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AccountsReceivableNetDetails" xlink:href="mg-20160229.xsd#AccountsReceivableNetDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AccountsReceivableNetTables" xlink:href="mg-20160229.xsd#AccountsReceivableNetTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AccruedExpensesAndOtherCurrentLiabilities" xlink:href="mg-20160229.xsd#AccruedExpensesAndOtherCurrentLiabilities" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AccruedExpensesAndOtherCurrentLiabilitiesDetails" xlink:href="mg-20160229.xsd#AccruedExpensesAndOtherCurrentLiabilitiesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:href="mg-20160229.xsd#AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/Acquisitions" xlink:href="mg-20160229.xsd#Acquisitions" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AcquisitionsAcquisitionRelatedExpenseDetails" xlink:href="mg-20160229.xsd#AcquisitionsAcquisitionRelatedExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AcquisitionsNarrativeDetails" xlink:href="mg-20160229.xsd#AcquisitionsNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AcquisitionsPreliminaryPurchasePriceAllocationDetails" xlink:href="mg-20160229.xsd#AcquisitionsPreliminaryPurchasePriceAllocationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/AcquisitionsTables" xlink:href="mg-20160229.xsd#AcquisitionsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/CommitmentsAndContingencies" xlink:href="mg-20160229.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/CommitmentsAndContingenciesDetails" xlink:href="mg-20160229.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/CondensedConsolidatedBalanceSheets" xlink:href="mg-20160229.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="mg-20160229.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentation" xlink:href="mg-20160229.xsd#DescriptionOfBusinessandBasisOfPresentation" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationAdditionalInformationDetails" xlink:href="mg-20160229.xsd#DescriptionOfBusinessandBasisOfPresentationAdditionalInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationImmaterialCorrectionDetails" xlink:href="mg-20160229.xsd#DescriptionOfBusinessandBasisOfPresentationImmaterialCorrectionDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationPolicies" xlink:href="mg-20160229.xsd#DescriptionOfBusinessandBasisOfPresentationPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationTables" xlink:href="mg-20160229.xsd#DescriptionOfBusinessandBasisOfPresentationTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/DocumentAndEntityInformation" xlink:href="mg-20160229.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/EarningsPerShare" xlink:href="mg-20160229.xsd#EarningsPerShare" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/EarningsPerShareDetails" xlink:href="mg-20160229.xsd#EarningsPerShareDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/EarningsPerShareTables" xlink:href="mg-20160229.xsd#EarningsPerShareTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/FairValueMeasurements" xlink:href="mg-20160229.xsd#FairValueMeasurements" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/FairValueMeasurementsDetails" xlink:href="mg-20160229.xsd#FairValueMeasurementsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/FairValueMeasurementsTables" xlink:href="mg-20160229.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/Goodwill" xlink:href="mg-20160229.xsd#Goodwill" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/GoodwillDetails" xlink:href="mg-20160229.xsd#GoodwillDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/GoodwillTables" xlink:href="mg-20160229.xsd#GoodwillTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/IntangibleAssets" xlink:href="mg-20160229.xsd#IntangibleAssets" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/IntangibleAssetsDetails" xlink:href="mg-20160229.xsd#IntangibleAssetsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/IntangibleAssetsTables" xlink:href="mg-20160229.xsd#IntangibleAssetsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/LongTermDebt" xlink:href="mg-20160229.xsd#LongTermDebt" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/LongTermDebtAdditionalInformationDetails" xlink:href="mg-20160229.xsd#LongTermDebtAdditionalInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/LongTermDebtScheduleOfLongTermDebtDetails" xlink:href="mg-20160229.xsd#LongTermDebtScheduleOfLongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/LongTermDebtTables" xlink:href="mg-20160229.xsd#LongTermDebtTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/PropertyPlantAndEquipmentNet" xlink:href="mg-20160229.xsd#PropertyPlantAndEquipmentNet" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/PropertyPlantAndEquipmentNetDetails" xlink:href="mg-20160229.xsd#PropertyPlantAndEquipmentNetDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/PropertyPlantAndEquipmentNetTables" xlink:href="mg-20160229.xsd#PropertyPlantAndEquipmentNetTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/SegmentDisclosure" xlink:href="mg-20160229.xsd#SegmentDisclosure" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/SegmentDisclosureFinancialInformationBySegmentDetails" xlink:href="mg-20160229.xsd#SegmentDisclosureFinancialInformationBySegmentDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/SegmentDisclosureRevenuesByGeographicAreaDetails" xlink:href="mg-20160229.xsd#SegmentDisclosureRevenuesByGeographicAreaDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/SegmentDisclosureTables" xlink:href="mg-20160229.xsd#SegmentDisclosureTables" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/ShareBasedCompensation" xlink:href="mg-20160229.xsd#ShareBasedCompensation" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/ShareBasedCompensationPerformanceRestrictedStockUnitsDetails" xlink:href="mg-20160229.xsd#ShareBasedCompensationPerformanceRestrictedStockUnitsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/ShareBasedCompensationRestrictedStockUnitAwardsDetails" xlink:href="mg-20160229.xsd#ShareBasedCompensationRestrictedStockUnitAwardsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/ShareBasedCompensationStockOptionsDetails" xlink:href="mg-20160229.xsd#ShareBasedCompensationStockOptionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/UnauditedCondensedConsolidatedStatementsOfCashFlows" xlink:href="mg-20160229.xsd#UnauditedCondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/UnauditedCondensedConsolidatedStatementsOfComprehensiveIncome" xlink:href="mg-20160229.xsd#UnauditedCondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.mistrasgroup.com/role/UnauditedCondensedConsolidatedStatementsOfIncome" xlink:href="mg-20160229.xsd#UnauditedCondensedConsolidatedStatementsOfIncome" xlink:type="simple" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AccountsReceivableNet" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AccountsReceivableNetDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="loc_us-gaap_ReceivablesNetCurrent_a68159ca-ec68-f2ab-15db-a26e97e8e259" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_abbda90e-f8af-acc9-fd72-3c3d00d2dd63" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_a68159ca-ec68-f2ab-15db-a26e97e8e259" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_abbda90e-f8af-acc9-fd72-3c3d00d2dd63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_4fe9849b-8dc6-3f26-f878-f188f88a440c" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_a68159ca-ec68-f2ab-15db-a26e97e8e259" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_4fe9849b-8dc6-3f26-f878-f188f88a440c" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AccountsReceivableNetTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AccruedExpensesAndOtherCurrentLiabilities" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AccruedExpensesAndOtherCurrentLiabilitiesDetails" xlink:type="extended">
    <loc xlink:href="mg-20160229.xsd#mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent" xlink:label="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:type="locator" />
    <loc xlink:href="mg-20160229.xsd#mg_AccruedSalariesWagesAndEmployeeRelatedBenefitsCurrent" xlink:label="loc_mg_AccruedSalariesWagesAndEmployeeRelatedBenefitsCurrent_93f2461e-265c-71bb-0722-6924eb3c90dd" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:to="loc_mg_AccruedSalariesWagesAndEmployeeRelatedBenefitsCurrent_93f2461e-265c-71bb-0722-6924eb3c90dd" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_cabae1ba-6902-2ece-d067-b79dbf0ad4c1" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_cabae1ba-6902-2ece-d067-b79dbf0ad4c1" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_AccruedWorkersCompensationAndHealthBenefitsCurrent" xlink:label="loc_mg_AccruedWorkersCompensationAndHealthBenefitsCurrent_24b2f49e-8c55-d0ee-a833-6924ec55e477" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:to="loc_mg_AccruedWorkersCompensationAndHealthBenefitsCurrent_24b2f49e-8c55-d0ee-a833-6924ec55e477" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_a33614ee-2047-2d07-d4dc-cd97b29aa0eb" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:to="loc_us-gaap_DeferredRevenueCurrent_a33614ee-2047-2d07-d4dc-cd97b29aa0eb" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_048af4ee-7103-cb68-2311-629c6d180444" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_048af4ee-7103-cb68-2311-629c6d180444" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/Acquisitions" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AcquisitionsAcquisitionRelatedExpenseDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AcquisitionsNarrativeDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AcquisitionsPreliminaryPurchasePriceAllocationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_8e82af62-5d0c-8a44-003d-d4557b49ee76" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_9a051955-1cb2-d93f-98cb-62192a545262" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_8e82af62-5d0c-8a44-003d-d4557b49ee76" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_9a051955-1cb2-d93f-98cb-62192a545262" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_efa58596-7267-76e0-adcd-e6ec707ad2f5" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_8e82af62-5d0c-8a44-003d-d4557b49ee76" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_efa58596-7267-76e0-adcd-e6ec707ad2f5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_8e82af62-5d0c-8a44-003d-d4557b49ee76" xlink:to="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_a4db4765-1879-010d-2d7a-bf30bca94cd9" xlink:type="locator" />
    <calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_8e82af62-5d0c-8a44-003d-d4557b49ee76" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_a4db4765-1879-010d-2d7a-bf30bca94cd9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent_b0419091-032e-c384-ce03-ca388d51379a" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_8e82af62-5d0c-8a44-003d-d4557b49ee76" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent_b0419091-032e-c384-ce03-ca388d51379a" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/AcquisitionsTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/CommitmentsAndContingenciesDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_cd34decb-53b6-e0a9-28d5-0a9741c4b0f8" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_cd34decb-53b6-e0a9-28d5-0a9741c4b0f8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="loc_us-gaap_ReceivablesNetCurrent_a68159ca-ec68-f2ab-15db-a26e97e8e259" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_ReceivablesNetCurrent_a68159ca-ec68-f2ab-15db-a26e97e8e259" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_eae794c2-73ec-cd91-efb3-99a2ff1f24cf" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_InventoryNet_eae794c2-73ec-cd91-efb3-99a2ff1f24cf" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_dabadfa8-724e-a2d5-b648-d64b8eabce5a" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_DeferredTaxAssetsNetCurrent_dabadfa8-724e-a2d5-b648-d64b8eabce5a" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_f186537c-a0b4-9ca7-f59a-958a18f111e6" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_39eaeb62-7ee3-5503-48f5-08c2dff05e50" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_f186537c-a0b4-9ca7-f59a-958a18f111e6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_894a128f-2068-d267-1e3e-64c93d0ed5ca" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_894a128f-2068-d267-1e3e-64c93d0ed5ca" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_Goodwill_b108d604-1348-4e65-3817-2944b734c65a" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNetNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_41359e4c-71d8-9161-b054-7e575267275a" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_41359e4c-71d8-9161-b054-7e575267275a" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_9b98e689-e6db-3e5b-e5c3-3324fffb4edf" xlink:type="locator" />
    <calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_effc14df-fd72-eec8-ede9-64e0071b91bc" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_9b98e689-e6db-3e5b-e5c3-3324fffb4edf" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:to="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_22caddf9-3843-6329-6e39-dc458323b572" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_AccountsPayableCurrent_22caddf9-3843-6329-6e39-dc458323b572" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent" xlink:label="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent_24dc0889-4759-9579-63a3-6924ecbefbd2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_cb391e84-b205-7d47-a257-0dea5fb19043" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_LongTermDebtCurrent_cb391e84-b205-7d47-a257-0dea5fb19043" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeaseObligationsCurrent" xlink:label="loc_us-gaap_CapitalLeaseObligationsCurrent_0b597336-35f7-7160-5946-f7dfc763851e" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_CapitalLeaseObligationsCurrent_0b597336-35f7-7160-5946-f7dfc763851e" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_d02cabf3-c4d9-166f-23df-bbec715cbe7f" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_1de50dbc-01a9-6657-f83f-d1e74edfdf18" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_d02cabf3-c4d9-166f-23df-bbec715cbe7f" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_fe891e5b-d2af-f798-198f-f728ce0375a1" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_fe891e5b-d2af-f798-198f-f728ce0375a1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeaseObligationsNoncurrent" xlink:label="loc_us-gaap_CapitalLeaseObligationsNoncurrent_6d67a44a-7bb7-aca8-5783-acbb1fa2e12c" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_CapitalLeaseObligationsNoncurrent_6d67a44a-7bb7-aca8-5783-acbb1fa2e12c" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_d3900b70-6aae-8c94-5a39-4a06f81c5d62" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_d3900b70-6aae-8c94-5a39-4a06f81c5d62" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_7f5c7cfd-4659-429c-35ab-266d67961421" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4e70462c-e5f6-e2d9-0cf5-7f1332ddbc05" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_7f5c7cfd-4659-429c-35ab-266d67961421" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9a5c5aff-ee63-a4f2-571a-3515b5d26a3b" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9a5c5aff-ee63-a4f2-571a-3515b5d26a3b" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9a5c5aff-ee63-a4f2-571a-3515b5d26a3b" xlink:to="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_359b0ac4-80ce-a291-f73b-cff103b81eae" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_PreferredStockValue_359b0ac4-80ce-a291-f73b-cff103b81eae" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_ce40a301-9b6b-9fc3-bfb6-dfbb8fcdf29b" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_CommonStockValue_ce40a301-9b6b-9fc3-bfb6-dfbb8fcdf29b" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_9158c8ad-1189-2464-9c41-553e6a22df6c" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_AdditionalPaidInCapital_9158c8ad-1189-2464-9c41-553e6a22df6c" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_1d565cd0-d7bf-de89-4dbe-a484007b1fe8" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_1d565cd0-d7bf-de89-4dbe-a484007b1fe8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_dd6b7206-c19f-4dd5-339b-1369c57cfe0f" xlink:type="locator" />
    <calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_d0f349aa-18e3-6323-86ad-665f8773c064" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_dd6b7206-c19f-4dd5-339b-1369c57cfe0f" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_be52b263-dda5-21e0-250c-b71c8efa5893" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9a5c5aff-ee63-a4f2-571a-3515b5d26a3b" xlink:to="loc_us-gaap_MinorityInterest_be52b263-dda5-21e0-250c-b71c8efa5893" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_53d4115f-c3d1-6e9c-3f23-fd144b27061e" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_4a314f0d-c6fa-5cf2-0be1-add747465af3" xlink:to="loc_us-gaap_CommitmentsAndContingencies_53d4115f-c3d1-6e9c-3f23-fd144b27061e" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentation" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationAdditionalInformationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationImmaterialCorrectionDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationPolicies" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/DescriptionOfBusinessandBasisOfPresentationTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/EarningsPerShare" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/EarningsPerShareDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_ca9bebe4-4073-b721-7b75-1a0086593d58" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8afbf9ec-40f2-ac04-dde9-64f96fdfbf74" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_ca9bebe4-4073-b721-7b75-1a0086593d58" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8afbf9ec-40f2-ac04-dde9-64f96fdfbf74" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_IncrementalCommonSharesAttributableToStockOptionsOutstanding" xlink:label="loc_mg_IncrementalCommonSharesAttributableToStockOptionsOutstanding_f02c1405-5cf9-d2d7-4418-6924ebe917ec" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_ca9bebe4-4073-b721-7b75-1a0086593d58" xlink:to="loc_mg_IncrementalCommonSharesAttributableToStockOptionsOutstanding_f02c1405-5cf9-d2d7-4418-6924ebe917ec" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding" xlink:label="loc_mg_IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding_bff1452d-c056-0c53-4838-6924ea918348" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_ca9bebe4-4073-b721-7b75-1a0086593d58" xlink:to="loc_mg_IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding_bff1452d-c056-0c53-4838-6924ea918348" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/EarningsPerShareTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/FairValueMeasurements" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_190f7f5c-4b8c-bf2f-74c0-cab5f1deb02f" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_0fe5317b-bdcf-7a27-121f-55fe035264d7" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_190f7f5c-4b8c-bf2f-74c0-cab5f1deb02f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_0fe5317b-bdcf-7a27-121f-55fe035264d7" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/Goodwill" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/GoodwillDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/GoodwillTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/IntangibleAssets" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/IntangibleAssetsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_894a128f-2068-d267-1e3e-64c93d0ed5ca" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0b66a991-68b5-43d2-3cb3-4ea68bba2b7e" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_894a128f-2068-d267-1e3e-64c93d0ed5ca" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0b66a991-68b5-43d2-3cb3-4ea68bba2b7e" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_5fad788a-33b8-6ace-c3c4-7d91cd9f63e4" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_894a128f-2068-d267-1e3e-64c93d0ed5ca" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_5fad788a-33b8-6ace-c3c4-7d91cd9f63e4" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/IntangibleAssetsTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/LongTermDebt" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/LongTermDebtAdditionalInformationDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/LongTermDebtScheduleOfLongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_9210187e-cdda-2312-446f-000237db141c" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_cb391e84-b205-7d47-a257-0dea5fb19043" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_9210187e-cdda-2312-446f-000237db141c" xlink:to="loc_us-gaap_LongTermDebtCurrent_cb391e84-b205-7d47-a257-0dea5fb19043" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_fe891e5b-d2af-f798-198f-f728ce0375a1" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_9210187e-cdda-2312-446f-000237db141c" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_fe891e5b-d2af-f798-198f-f728ce0375a1" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/LongTermDebtTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/PropertyPlantAndEquipmentNet" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/PropertyPlantAndEquipmentNetDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_6591f040-08b3-69a1-a560-c70736475ada" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_6591f040-08b3-69a1-a560-c70736475ada" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_b84a1570-30ad-4e3a-2391-9767a64e15fd" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_7ce178a4-245f-fa78-36a1-552609a67554" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_b84a1570-30ad-4e3a-2391-9767a64e15fd" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/PropertyPlantAndEquipmentNetTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/SegmentDisclosure" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/SegmentDisclosureFinancialInformationBySegmentDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/SegmentDisclosureRevenuesByGeographicAreaDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/SegmentDisclosureTables" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/ShareBasedCompensation" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/ShareBasedCompensationPerformanceRestrictedStockUnitsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/ShareBasedCompensationRestrictedStockUnitAwardsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/ShareBasedCompensationStockOptionsDetails" xlink:type="extended" />
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/UnauditedCondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_783b94c5-664a-4bc7-f813-8c258cc934b7" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_783b94c5-664a-4bc7-f813-8c258cc934b7" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_DeferredIncomeTaxNoncashExpenseBenefit" xlink:label="loc_mg_DeferredIncomeTaxNoncashExpenseBenefit_0ca2d9e4-9f47-12ab-5c06-6924ec918326" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_mg_DeferredIncomeTaxNoncashExpenseBenefit_0ca2d9e4-9f47-12ab-5c06-6924ec918326" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_d4c99b59-c44a-c4ac-309f-0bddfdb944a5" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_ShareBasedCompensation_d4c99b59-c44a-c4ac-309f-0bddfdb944a5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_eec6361a-c94c-2d28-56f0-a37dfa5959ae" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_eec6361a-c94c-2d28-56f0-a37dfa5959ae" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_8a9fbf97-3c14-4351-6d6b-553e136a9df1" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_8a9fbf97-3c14-4351-6d6b-553e136a9df1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_91d80b53-6368-7466-a11d-02030d33de5c" xlink:type="locator" />
    <calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_91d80b53-6368-7466-a11d-02030d33de5c" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_59947135-2495-391e-9e35-ed6effebb894" xlink:type="locator" />
    <calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_59947135-2495-391e-9e35-ed6effebb894" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_709900d0-f7b0-b950-eae5-eeb8fc36b367" xlink:type="locator" />
    <calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_709900d0-f7b0-b950-eae5-eeb8fc36b367" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_6726a997-b874-a6f6-d79f-e0a4bde49905" xlink:type="locator" />
    <calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_6726a997-b874-a6f6-d79f-e0a4bde49905" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableTrade" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableTrade_8d552e1d-3ef1-9e76-644c-2357bedabbd5" xlink:type="locator" />
    <calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableTrade_8d552e1d-3ef1-9e76-644c-2357bedabbd5" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities" xlink:label="loc_mg_IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities_5910b674-8921-10a0-17c3-6924eabcfe09" xlink:type="locator" />
    <calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_mg_IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities_5910b674-8921-10a0-17c3-6924eabcfe09" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_3eb22aca-47ee-3290-8d2e-e73a1c67010e" xlink:type="locator" />
    <calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_3eb22aca-47ee-3290-8d2e-e73a1c67010e" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:type="locator" />
    <calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_916e1eb7-21fa-e5f0-a15f-0b05ed633776" xlink:to="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_386292ff-155c-0309-455a-2b91b395b3da" xlink:type="locator" />
    <calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_386292ff-155c-0309-455a-2b91b395b3da" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_PaymentsToAcquireIntangibleAssetsAndSoftware" xlink:label="loc_mg_PaymentsToAcquireIntangibleAssetsAndSoftware_a1624799-d5a2-39dc-1b16-6924eb26fb0b" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:to="loc_mg_PaymentsToAcquireIntangibleAssetsAndSoftware_a1624799-d5a2-39dc-1b16-6924eb26fb0b" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4852d3ee-c33e-1b07-798c-41e651367343" xlink:type="locator" />
    <calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4852d3ee-c33e-1b07-798c-41e651367343" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_20b2f8e5-bc13-7276-9568-761d012338aa" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_58a5bd26-e5f4-de8f-6118-f713733148b8" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_20b2f8e5-bc13-7276-9568-761d012338aa" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:type="locator" />
    <calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfLongTermCapitalLeaseObligations" xlink:label="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_51617b66-bd39-6ab3-80dc-0e2706dd562a" xlink:type="locator" />
    <calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_51617b66-bd39-6ab3-80dc-0e2706dd562a" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_dbe54487-f43f-8212-69b5-2b562fa61c57" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_dbe54487-f43f-8212-69b5-2b562fa61c57" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_bb66d22b-00d8-8213-df94-91578f68ce48" xlink:type="locator" />
    <calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_bb66d22b-00d8-8213-df94-91578f68ce48" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_9bd3f42f-b4f0-9974-1138-b2e115f0ecf0" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_9bd3f42f-b4f0-9974-1138-b2e115f0ecf0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_7d788ff9-1bb0-e85b-e2f1-868916f4ec6d" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_7d788ff9-1bb0-e85b-e2f1-868916f4ec6d" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_PaymentsOfContingentConsiderationForBusinessAcquisitions" xlink:label="loc_mg_PaymentsOfContingentConsiderationForBusinessAcquisitions_fb6fb92a-f090-6bf0-c039-6924eb1d3aec" xlink:type="locator" />
    <calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_mg_PaymentsOfContingentConsiderationForBusinessAcquisitions_fb6fb92a-f090-6bf0-c039-6924eb1d3aec" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_2660b777-f313-aa0f-f2f0-b727ebbc5b13" xlink:type="locator" />
    <calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_2660b777-f313-aa0f-f2f0-b727ebbc5b13" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_9dbeb004-67a9-1b19-c357-8b5cbf0013ee" xlink:type="locator" />
    <calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_9dbeb004-67a9-1b19-c357-8b5cbf0013ee" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_f1b85fa1-97cd-57cc-5318-fb8dd976eb81" xlink:type="locator" />
    <calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_a678c20d-a481-ef6a-800a-4bd566075d81" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_f1b85fa1-97cd-57cc-5318-fb8dd976eb81" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations_791aba78-3ace-4eb4-b202-a0c54f2572bf" xlink:type="locator" />
    <calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_ff5db18e-7b91-5a5d-e914-0527b02a8012" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations_791aba78-3ace-4eb4-b202-a0c54f2572bf" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/UnauditedCondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_640557c9-9806-6bef-9084-9cc792948f77" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_038f4602-9abc-1f60-05a2-6f69306a77ae" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_640557c9-9806-6bef-9084-9cc792948f77" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_038f4602-9abc-1f60-05a2-6f69306a77ae" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_038f4602-9abc-1f60-05a2-6f69306a77ae" xlink:to="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_fbd5cad0-09ca-a68e-f9d5-77ff2ba61ae4" xlink:type="locator" />
    <calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_038f4602-9abc-1f60-05a2-6f69306a77ae" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_fbd5cad0-09ca-a68e-f9d5-77ff2ba61ae4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_560dfcb1-0fb6-5ffa-6e3b-8257ed923a94" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_640557c9-9806-6bef-9084-9cc792948f77" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_560dfcb1-0fb6-5ffa-6e3b-8257ed923a94" xlink:type="arc" />
  </calculationLink>
  <calculationLink xlink:role="http://www.mistrasgroup.com/role/UnauditedCondensedConsolidatedStatementsOfIncome" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:to="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_f0ea1b66-a9f7-f42c-6882-4cca5faefea1" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_f0ea1b66-a9f7-f42c-6882-4cca5faefea1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_f0ea1b66-a9f7-f42c-6882-4cca5faefea1" xlink:to="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:to="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_533a4e74-899a-26d7-f9ea-a738a9e615c4" xlink:type="locator" />
    <calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:to="loc_us-gaap_SalesRevenueNet_533a4e74-899a-26d7-f9ea-a738a9e615c4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_a64684b5-99de-91bb-54dd-5702d4624c68" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_a64684b5-99de-91bb-54dd-5702d4624c68" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfGoodsSoldDepreciation" xlink:label="loc_us-gaap_CostOfGoodsSoldDepreciation_e08a6b61-fecb-4e73-9383-ed4feda59672" xlink:type="locator" />
    <calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_ae720951-4a78-255d-8bd1-88ff26a27caf" xlink:to="loc_us-gaap_CostOfGoodsSoldDepreciation_e08a6b61-fecb-4e73-9383-ed4feda59672" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_37d23128-e0be-7b8b-d6c6-f3d1ac14cac9" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_37d23128-e0be-7b8b-d6c6-f3d1ac14cac9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_6a3cb05a-f9c0-32f6-d20f-a948f53d0ee5" xlink:type="locator" />
    <calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_6a3cb05a-f9c0-32f6-d20f-a948f53d0ee5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_eacd1e25-d59d-a3b6-a15a-f5d867179d3e" xlink:type="locator" />
    <calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:to="loc_us-gaap_DepreciationAndAmortization_eacd1e25-d59d-a3b6-a15a-f5d867179d3e" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_AcquisitionRelatedCostsAndFairValueAdjustmentsToInitialPurchasePriceAllocation" xlink:label="loc_mg_AcquisitionRelatedCostsAndFairValueAdjustmentsToInitialPurchasePriceAllocation_546d83fc-f03d-7e93-799d-6924ebc411d1" xlink:type="locator" />
    <calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_0ea1551e-1643-5e21-4c6e-6431fd87aa68" xlink:to="loc_mg_AcquisitionRelatedCostsAndFairValueAdjustmentsToInitialPurchasePriceAllocation_546d83fc-f03d-7e93-799d-6924ebc411d1" xlink:type="arc" />
    <loc xlink:href="mg-20160229.xsd#mg_InterestExpenseAndAmortizationOfDeferredCharges" xlink:label="loc_mg_InterestExpenseAndAmortizationOfDeferredCharges_08f92112-dab8-6618-59a3-6924ebcb5b8a" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_f0ea1b66-a9f7-f42c-6882-4cca5faefea1" xlink:to="loc_mg_InterestExpenseAndAmortizationOfDeferredCharges_08f92112-dab8-6618-59a3-6924ebcb5b8a" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b8dcf191-083d-828d-7b9f-e2d2969b89f4" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_5f8983ec-dfa4-10d0-f53d-c0676300a16f" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_b8dcf191-083d-828d-7b9f-e2d2969b89f4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6e1329dd-9911-a537-956e-8ca9c6805be6" xlink:type="locator" />
    <calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_e62ce8b8-4401-2622-8598-3e644745e95e" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6e1329dd-9911-a537-956e-8ca9c6805be6" xlink:type="arc" />
  </calculationLink>
</linkbase>
