Overview#

Check Digit

Check Digit GS1 Global Trade Item Number [1]#

is an additional digit, used to verify that a barcode has been scanned correctly. It is computed modulo 10, where the weights in the checksum calculation alternate 3 and 1. In particular, since the weights are relatively prime to 10, the EAN-13 system will detect all single digit errors. It also recognizes 90% of transposition errors (all cases, where the difference between adjacent digits is not 5).

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« This page (revision-2) was last changed on 28-Oct-2017 19:01 by jim