ORCID Check Digit Calculator

How ORCID Check Digit Calculator Works?

The ORCID Check Digit Calculator works by applying ISO 7064 MOD 11-2 to the first 15 digits of an Open Researcher and Contributor ID (ORCID iD) and appending a check character 0–9 or X.

1. 1Remove the hyphens and the https://orcid.org/ prefix.
2. 2Process the 15 digits with total = ((total + digit) × 2) mod 11.
3. 3Compute the remainder of the total modulo 11 and subtract from 12.
4. 4Take the result modulo 11 and write 10 as X.
5. 5Format the iD as XXXX-XXXX-XXXX-XXXX.

ORCID Check Digit Calculator Formula

The ORCID formula is c = (12 − (total mod 11)) mod 11, as published in the ORCID support documentation.

total = 0
for each digit: total = (total + digit) × 2
remainder = total mod 11
c = (12 − remainder) mod 11,  10 → X

• total is the doubled running sum.

Running total after 15 digits = 5
Check value = (12 − 5) mod 11 = 7
ORCID iD = 0000-0002-1825-0097

ORCID Check Digit Calculator Conversion Table

The ORCID conversion table lists sample ORCID payloads with their check character, including an X result.

What is ORCID Check Digit Calculator?

An ORCID Check Digit Calculator is a tool that computes or verifies the last character of an ORCID iD. An ORCID iD is a free, persistent 16-character identifier for researchers.

ORCID iDs come from a block of the ISNI number space reserved for ORCID. The check character X appears in about 1 of every 11 iDs (9%).

What are the uses of ORCID Check Digit Calculator?

There are 3 main uses of the ORCID Check Digit Calculator, including manuscript systems, grant applications, and institutional repositories.

• Manuscript systems: Journals validate author iDs at submission.
• Grant applications: Funders check iDs in applicant profiles.
• Institutional repositories: Universities clean ORCID fields in research records.