How do I calculate the check digit?

The check digit is calculated through the service Check Digit Calculator.

To use Check Digit Calculator, you need to be a customer to GS1.

When you calculate the check digit,you need to provide your company prefix and a serial number. The serial number you choose yourself, its length is determined by the size of your company prefix. If you have GS1 company prefix Single numbers, you do not need to add a serial number after your company prefix to calculate the check digit.

You can calculate multiple check digits at one and the same time.