Calculate GTIN-13 check digit for 6291041500213
Multiply the 12 data digits by alternating GS1 weights, obtain sum 57, and calculate final check digit 3.
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Two complete GS1 Mod-10 calculations
Calculate check digit 3 for GTIN-13 body 629104150021, then validate synthetic SSCC-18 123456789012345675 by recomputing its final 5.
Validate an SSCC-18 check digit
Recalculate synthetic SSCC-18 123456789012345675 from its 17-digit body, weighted sum 155, and expected final digit 5.
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