Enter your 11-digit UPC number and the check digit (12th digit) is calculated automatically. Used for North American retail products — Amazon US, Walmart, Target and all major retailers require a valid UPC-A with correct check digit.
How the UPC-A Check Digit Works
The UPC-A check digit algorithm is the reverse of EAN-13. Positions 1,3,5,7,9,11 are multiplied by 3. Positions 2,4,6,8,10 are multiplied by 1. Sum all results, find the nearest multiple of 10 above, subtract. That difference is the check digit (position 12).
UPC-A vs EAN-13
UPC-A has 12 digits (used in North America). EAN-13 has 13 digits (used globally). A UPC-A barcode is technically a subset of EAN-13 — add a leading zero to any UPC-A and you get a valid EAN-13. Most modern scanners read both formats.
Frequently Asked Questions
How do I calculate a UPC-A check digit?
Enter your 11-digit UPC number above. The 12th digit is calculated automatically.
Is UPC-A the same as EAN-13?
Not exactly. UPC-A has 12 digits; EAN-13 has 13. Adding a leading 0 to a UPC-A gives a valid EAN-13.
Does Amazon require UPC or EAN?
Amazon accepts both. For US products, UPC-A is standard. For global products, EAN-13 is preferred.
Calculate UPC Check Digit — Free
Enter 11 digits, get complete UPC-A with barcode. No signup.
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