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  • UPC Check Digit CalculatorFor sellers

UPC and EAN check digit calculator

This UPC check digit calculator works out the last digit: type a UPC, EAN or GTIN without it to get the check digit, or the full number to see whether it is right. It works for UPC-A (12 digits), EAN-13, EAN-8 and GTIN-14.

Your number

Number

Without the last digit to work it out, or the full number to check it.

Good to know

What the check digit is

The last digit of every UPC, EAN and GTIN is worked out from the others. A scanner does the same sum, so a number that was misread or mistyped is caught instead of ringing up the wrong product.

How it is worked out

  • Starting from the right of the number without its check digit, multiply the digits by 3 and 1 in turn.
  • Add up the results.
  • The check digit is what you add to reach the next multiple of 10 (0 if the sum already is one).
  • Example: for 03600029145 the sum is 58, so the check digit is 2 and the UPC is 036000291452.

Sources: GS1: How to calculate a check digit manually,GS1 US: Get started with UPC barcodes

A right check digit is not a registered number

Any digits can be given a correct check digit. Whether the number belongs to your brand is a different matter: UPC and EAN numbers are licensed through GS1, and most retailers and marketplaces check that the number is yours.

Sources: GS1 US: Get started with UPC barcodes

Questions

Why do 12 or 13 digits give two answers?

12 digits can be a full UPC-A, which is checked, or the first 12 digits of an EAN-13, which gets its 13th digit. 13 digits can be a full EAN-13 or the first 13 of a GTIN-14. Pick the one you are making.

Is a UPC-A the same as an EAN-13?

A UPC-A is an EAN-13 that starts with 0: scanners read 036000291452 and 0036000291452 as the same product.

Are my numbers saved or sent anywhere?

No. The check runs in your browser; your numbers aren’t saved or sent.