5-step algorithm for check digit calculation:
Let's assume that we are using the fictitious EAN Code 054321223455.
- Add all of the digits in the odd positions (digits in position 1, 3, 5, 7, 9, and 11).
0 + 4 + 2 + 2 + 3 + 5 = 16
- Add all of the digits in even positions (digits in position 2, 4, 6, 8, 10 and 12).
5 + 3 + 1 + 2 + 4 + 5 = 20
- Multiply by 3.
20 * 3 = 60
- Sum the results of steps 3 and 2.
16 + 60 = 76
- Determine what number needs to be added to the result of step 4 in order to create a multiple of 10.
76 + 4 = 80
The check digit therefore equals 4.
EAN (GTIN-13) bar code check digit calculator
UPC (GTIN-12) bar code check digit calculator
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