User's Manual

J-4
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