ORCID Checksum digit
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ABCDEFGH
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Calculating the ORCID Checksum
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The last character in the ORCID ID is a check sum. In accordance with ISO/IEC 7064:2003, MOD 11-2, this check sum must be '0' - '9' though the check digit may also be 'X' (representing the value 10). Below is how to calculate it. Learn more about the ORCID ID Format at http://support.orcid.org/knowledgebase/articles/116780-structure-of-the-orcid-identifier
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DIGITORCID IDSub-CalculationCALCULATION
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D1=0SC1=0=D1 * 2
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D2=0SC2=0=(D2+SC1) * 2
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D3=0SC3=0=(D3+SC2) * 2
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D4=0SC4=0=(D4+SC3) * 2
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-
9
D5=0SC5=0=(D5+SC4) * 2
10
D6=0SC6=0=(D6+SC5) * 2
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D7=0SC7=0=(D7+SC6) * 2
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D8=3SC8=6=(D8+SC7) * 2
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-
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D9=1SC9=14=(D9+SC8) * 2
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D10=4SC10=36=(D10+SC9) * 2
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D11=1SC11=74=(D11+SC10) * 2
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D12=5SC12=158=(D12+SC11) * 2
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-
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D13=9SC13=334=(D13+SC12) * 2
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D14=2SC14=672=(D14+SC13) * 2
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D15=6SC15=1356=(D15+SC14) * 2
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remainder3=MOD(SC15,11)
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D16 - check=9result=MOD(12-remainder,11)
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(if value is '10', digit is 'X')