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This same formula is used for EAN-13 (using the 1-12 digits) and
EAN-8 (using the 1-7 digits).
UPC-E Checksum Calculation
Use the sample data of 123456 to demonstrate the UPC-E checksum
calculation:
1. The 6 digit UPC-E code is converted to a 10-digit code,
using an expansion scheme based on the sixth digit:
If the code
ends in:
UPC-E
Data
Insertion
Digits
Insertion
Position
10 digit
code
0
abcde0 00000
3
ab00000cde
1
abcde1 10000
3
ab10000cde
2
abcde2 20000
3
ab20000cde
3
abcde3 00000
4
abc00000de
4
abcde4 00000
5
abcd00000e
5
abcde5 0000
6
abcde00005
6
abcde6 0000
6
abcde00006
7
abcde7 0000
6
abcde00007
8
abcde8 0000
6
abcde00008
9
abcde9 0000
6
abcde00009
Because the sample UPC-E code ends in a 6, the insertion digits
0000 are inserted at the sixth digit (insertion position 6):
1234500006
2. Add the Number System Character of 0 to the sample data:
01234500006
3. Use the UPC-A check digit calculation described in the
previous section to produce a check digit as if it were a
UPC-A code. The check digit for the sample data is:
5
4. The complete 8 digit code consists of the Number System
Character, the original 6 digit code and the check digit:
01234565