CheckDigit
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GS1 Mod-10 utility

GLN-13 check digit calculator

Enter 12 body digits to generate a 13-digit GLN-13, or switch to Validate and enter all 13 digits. Leading zeros are preserved.

GLN-13 worked example

How to calculate a GLN check digit

  1. A GLN has 12 body digits followed by one check digit. Preserve every leading zero and enter only the 12 body digits in Generate mode.
  2. For body 950600014044, the digits weighted by 1 total 17 and the digits weighted by 3 total 16; 17 + 3 × 16 gives a weighted sum of 65.
  3. The next multiple of 10 is 70, so 70 − 65 = 5. Append 5 to obtain the complete GLN 9506000140445.

This arithmetic only calculates or validates the final digit. It does not issue, assign, look up or prove ownership of a GLN, verify a location or party, or create a barcode or label.

Exact GLN-13 calculationBody: 950600014044

17 + 3 × 16 = 65; (10 − 65 mod 10) mod 10 = 5.

Check digit: 5 · Complete GLN: 9506000140445

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GS1 Mod-10 check digit

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Enter exactly 12 ASCII digits.

A matching check digit detects some entry errors. It does not prove that an identifier was issued, assigned correctly, authentic, or linked to a particular product or location.

Supported formats

Exact lengths, one shared rule

GTIN, GLN and SSCC use the same GS1 Mod-10 arithmetic but have different required lengths. CheckDigit validates the length before calculating.