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GS1 Denmark's terms and conditions and prices are changing as from 1 January 2024. Read more here

NOTE: Thursday April 25th we can only be contacted by email info@gs1.dk, due to an internal event.

NOTE: Monday September 18th and Tuesday September 19th until 12 noon, we can only be contacted by email info@gs1.dk, due to an external event

Calculate your check digit

The last digit of all GS1 numbers is a computer-generated check digit, which is calculated based on its preceding digits. The check digit is used to ensure correct composition of a number and barcode.

It is important that the check digit is correct - if it is incorrect, the barcode cannot be read.

Check digit calculator

You can calculate your check digit by entering your number in the white box to the right.

You can enter either 7, 11, 12, 13 or 17 digits in the calculator depeding on the barcode type (GTIN-8, UPC, GTIN-13, GTIN-14 and SSCC).

If you need to calculate multiple check digits simulaneously, please contact us to receive an Excel sheet to make the calculations.

Check digits are calculated according to the Modulus 10 algorithm

We are ready to help

If you need assistance to calculate your check digit, please contact our trained customer consultants who are ready to help you.

Member Service opening hours:

Monday to Thursday: 08:30 to 15:30
Friday: 09:00 to 15:00

+45 39 27 85 27

Or by email: info@gs1.dk

Peter Alberg Nielsen
GS1Trade Service Consultant
+45 39 16 90 11
Irene Lentz
Customer Consultant
+45 39 16 90 07
Charlotte Nevdal
Head of Member Service
+45 39 16 90 14