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An EAN-13 is the European analogue to the 12-digit Universal Price Code (UPC) found on most American consumer products. An EAN-13 starts with a two-digit number that identifies the country or region numbering authority that issued it, whereas a UPC begins with one digit.
Otherwise, the formats are the same.
EAN13 Anatomy
An EAN-13 also contains a five-digit manufacturer code, a five-digit product code and a check digit. This last digit is calculated according to an algorithm and serves to validate an EAN-13.
[tweet]Calculating the check digit manually can be tedious, but is nonetheless simple.
Procedure
Write down an EAN-13. For example, 5010017088439 is the EAN-13 from a European consumer product.
Number the digits in the EAN from right to left, ignoring the check digit (the last digit), which you will compute.The number without the check digit is 501001708843.Number the digits 1 through 12, counting “3” as the first digit and “5” as the last, in this example.Add the odd digits: 3 + 8 + 0 + 1 + 0 + 0 = 12.Multiply the answer by 3: 12 x 3 = 36.Add the digits in even positions: 4 + 8 + 7 + 0 + 1 + 5 = 25.Add the results from previous steps: 36 + 25 = 61Subtract the number from the next multiple of 10. In the example, the next multiple of 10 after 61 is 70, so you should subtract 61 from 70: 70 - 61 = 9. This is the check digit in the EAN!
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