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.
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), Global Individual Asset Identifier (GIAI) and Global Model Number (GMN).
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.