UPC Barcode Generator

Check Digit Calculator

Find the last digit of any UPC, EAN, GTIN-14 or SSCC number. Type the digits and the check digit appears instantly.

Got the full number? Make a UPC barcode or an EAN-13 barcode.

How the check digit is calculated

  1. Starting from the right-hand digit, multiply digits alternately by 3 and 1.
  2. Add up the results.
  3. The check digit is the number you need to add to reach the next multiple of 10. If the sum is already a multiple of 10, the check digit is 0.

Example: for 03600029145, the weighted sum is 58, so the check digit is 2 and the full UPC is 036000291452.

Frequently asked questions

What is a check digit?

The last digit of a UPC, EAN or GTIN. It's calculated from the other digits so a scanner can tell if a number was misread or mistyped.

Does this work for SSCC and GTIN-14?

Yes. GS1 uses the same method for GTIN-8, GTIN-12 (UPC), GTIN-13 (EAN), GTIN-14 and SSCC-18. Enter the digits without the check digit.

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