Barcode Check Digit Calculator

Choose an identifier length and calculate or verify its final check digit in the browser.

Identifier type

Digits

—Calculated check digit

—Complete identifier

—Digits

—Validation

Enter the number before the final check digitUses the GS1 modulo-10 check-digit algorithm. It validates number structure only, not whether the identifier was officially assigned.

How to use this Barcode Check Digit Calculator

Calculate GS1 modulo-10 check digits for GTIN-8, GTIN-12, GTIN-13, GTIN-14, and SSCC-18. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.