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Check digit calculator

All GTINs need a check digit, and this is the last digit of the number.  The check digit is calculated from all the preceding digits, and it is used by any scanning system to check that the number scanned in from a barcode is correct.  This calculator can be used to work out the check digit for your GTINs, and for the 18-digit SSCC (serial shipping container code) used to identify logistics units.


Choose the appropriate GTIN or SSCC option from the dropdown list opposite.  The table below explains which GTINs usually appear in which GS1 barcodes.  Remember that a leading zero in front of a GTIN-13 does not change the number, but simply allows it to be printed in a barcode that requires 14-digits, such as an ITF-14 or GS1-128 barcode.

Symbology Code

The check digit result is calculated using the information submitted. Please ensure you have entered all numerical data accurately as Axicon cannot be held responsible for incorrect data entry.

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