Calculating the Check Digit
Film master suppliers, on-site printing equipment, and bar coding software packages
will calculate the check digit for you.
The check digit calculation (modulato 10 algorithm) is the same for EAN-13, EAN-8,
and TUN-14 numbers.
> Perform the following calculation using the EAN-13 number in Figure 1-5 above.
1. Starting with the first number on the right, add all the alter native numbers.
Multiply the result by three.
0 + 8 + 6 + 4 + 2 + 3 = 23 x 3 = 69
2. Starting with second number on the right, add all alternative numbers.
9 + 7 + 5 + 3 + 1 + 9 = 34
3. Add the results of steps one and two.
Total = 103
4. Add the number needed to bring the total to the next multiple of ten.
In this example, add seven. 7
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The number added to bring the total to the next multiple of ten becomes the
check digit. 110