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UPC Modulo checksum formula
|For those of you who wish to calculate your own mod check character,
here is the formula.
To follow, use this UPC as an example: 0-12345-67890-?
|Step 1||Starting at the left, sum all the characters in the ODD positiions
(e.g. first from the left, third from the left, etc.) STARTING WITH THE
NUMBER SYSTEM CHARACTER
.0 + 2 + 4 + 6 + 8 + 0 = 20
|Step 2||Multiply the sum we got in Step 1 by 3.
20 x 3 = 60
|Step 3||Starting at the left, sum all the characters in the EVEN positions.
1 + 3 + 5 + 7 + 9 = 25
|Step 4||Add the product of Step 2 to the sum of Step 3.
60 + 25 = 85
|Step 5||The modulo-10 check digit value is the smallest number which produces
a multiple of 10, when added to the sum in Step 4.
Hence, our check digit is 5.
|Our completed UPC would then be 0-12345-67890-5.|
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