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The last digit of a barcode number is a calculated check digit. The check digit is calculated from all the other numbers in the barcode and helps to confirm the integrity of your barcode number.
Simply enter the ID Number below and the Check Digit Calculator will calculate the last digit for you. Download and view these PDF instructions about the ID number and how to use the Check Digit Calculator.
If you prefer to calculate the check digit on your own, download and read these PDF instructions (300 KB).
Or, for all your barcode needs, use our online barcode creation tool, GS1 US Data Hub® | Product. It calculates the check digit automatically.
See how GS1 US Data Hub | Product makes creating accurate barcodes easy.
Watch the video (2:44 min.) >
Go to the Build a Sample U.P.C. Barcode tool >