Check Digit Calculator
What is a Check Digit and a Check Digit Calculator?
The last digit of all numeric fixed-length GS1 Identification (ID) Keys is a check digit, which is required and ensures the integrity of the key. The last digit, being the check digit, is calculated using a simple algorithm based on the preceding numbers in the key. The result is an accurately constructed and scannable barcode.
This page provides information for each GS1 ID Key, shows how the calculator works and even provides you step by step instructions on how to manually calculate the check digit by using the simple algorithm, should the need arise.
- Global Trade Item Number (GTIN) Check Digit Calculator
The four different formats of GTIN include GTIN-8, GTIN-12, GTIN-13 and GTIN14.
- Serial Shipping Container Code (SSCC) Check Digit Calculator
Enter 17 digits to calculate the 18th digit, which is the check digit.
- Global Location Number (GLN) Check Digit Calculator
Enter 12 digits to calculate the 13th digit, which is the check digit.
- Other GS1 identification keys Check Digit Calculator
To calculate the Check Digit for other GS1 identification keys, use the link below: Check digit calculator - Services | GS1