ORCID Checksum digit
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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-identifierThanks for your interest in the Checksum spreadsheet tool. Since this tool is used broadly, we ask that individuals make a copy of the file instead of editing this version directly. You can make a copy by following these steps:

1. Open the file: https://docs.google.com/spreadsheets/d/17KYZ-QMixxE55qxws2KovHy7LvC_ErfUKb2HzGiu3NQ/edit#gid=0

2. Click the "File" menu under the file name to expand the menu

3. Click "Make a copy..." and follow the instructions to save the copy to your own Google Drive.

4. ALTERNATIVELY, select "Download as..." from the File menu and select the format you would like. When prompted, name the file and indicate where you would like the file saved.

We also encourage you to 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')
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