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UPC CHECK
DIGIT.

Enter the first 11 digits of a UPC-A barcode and get the 12th check digit computed with the standard GS1 algorithm — plus the complete, scannable code.

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UPC-A CHECK DIGIT

COMPLETE THE
BARCODE.

11 of 11 digits — ready.
2
Check digit (12th)
Full UPC-A036000291452
Odd positions × 314 × 3 = 42
Even positions × 116
Weighted total58
HOW IT WORKS

Compute the 12th UPC-A check digit from the first 11 digits with the standard GS1 algorithm.

Enter the digits
Type the first 11 digits of your UPC-A barcode; non-digits are ignored and the counter shows when you have hit 11.
We check it
Sum the odd-position digits and multiply by 3, add the even-position digits, then check digit = (10 − total mod 10) mod 10.
Use the result
The hero number is the check digit; the full 12-digit UPC-A below is ready to encode into a barcode.
Put this on your site
Paste one line and the live upc check digit calculator runs on your page, free, with a link back here. No account, no key, nothing to update.
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