51
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