UPC Check Digit Calculator
Enter the first 11 digits of a UPC-A and get the final check digit, with the full number ready to use.
● Runs locally, nothing uploadedNo account needed
UPC-A check digit calculator
Enter the first 11 digits to compute the final check digit.
Enter exactly 11 digits (0/11).
Frequently asked questions
How is it calculated?
Odd-position digits are summed ×3 and even positions as-is; the check digit rounds the total to a multiple of ten.
Is my data sent anywhere?
No, the calculation is done in your browser.