UPC & EAN Check Digit Calculator
Ensure your barcode numbers are mathematically valid before printing thousands of packaging boxes. Validates GS1 Modulo-10 checksums for UPC-E, UPC-A, EAN-8, EAN-13, and ITF-14.
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How to Use This Tool in 3 Easy Steps
Enter Barcode Digits
Input the first 11 digits of a UPC or first 12 digits of an EAN.
Click Calculate
The Modulo-10 formula sums alternating odd and even multipliers.
Verify Check Digit
Copy the final validated check digit.
100% Private
Zero data collection
Instant Speed
<5ms client execution
Mobile Ready
Native app feel
100% Free
No account required
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Frequently Asked Questions (FAQ)
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