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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).
This Fact Sheet provides a detailed explanation of how to calculate the Check Digits for the diferent length GS1 Identification Numbers. Note: The Check Digit for a Zero Suppressed GTIN-12 (encoded in a UPC-Ebarcode) is calculated using the first eleven digits of the GTIN-12 in its expanded form.
Calculating your check digit The calculation is used to create the check digit for all the GS1 Identification Keys that require them, including GTINs and GLNs.
Suppose you want to find the Check Digit for the GTIN-12 (U.P.C.) Number 61414121022. Set up a table with 12 columns, and put the number 61414121022 into Positions One through Eleven. Position Twelve will be blank because it is reserved for the Check Digit.
The check digit is the last barcode number that makes sure the barcode is correctly composed. Find out here how to calculate your check digit manually.
The following calculation can be used to create the check digit for all the GS1 Identification Keys that require them, including GTINs and GLNs. Let’s take the GTIN 501234567890C as an example, where C is the check digit. This is how you calculate it:
With the check digit calculator from GS1 Switzerland, you can easily calculate your check digit. The GS1 basis number (GCP, GS1 Company Prefix) is the basis for the GS1 identification keys. These include, for example, the GTIN for products, the SSCC for logistics units and the GLN for locations. They enable unique identification worldwide.
