Check digit calculator
The last digit of a barcode number is a computer check digit which makes sure the barcode is correctly composed. Use our check digit calculator below to calculate a check digit.
What is a check digit?
The last digit of all fixed-length, numeric GS1 Identification Keys is a check digit that ensures the integrity of the key.
All GS1 ID Keys need a check digit, except Component/Part Identifier (CPID) and Global Individual Asset Identifier (GIAI). Global Model Number (GMN) includes a pair of check characters rather than a single check digit.
How does the check digit calculator work?
The check digit is calculated using a simple algorithm, based on the other numbers in the key.
Find out how to calculate a check digit manually.
Find out more
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