UPC Check Digit
UPC-A check digit from the first 11 digits (positions 1–11, left to right).
Inputs
Results
Check digit
7
Weighted sum93
How to Use This Calculator
- Enter the first 11 digits of a UPC-A barcode, one per field.
- The calculator computes the weighted sum using the modulo-10 algorithm.
- Read the 12th check digit in the output.
- Use this to verify or generate valid UPC-A barcodes for product labeling.
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