ISBN specifications are available from:
American National Standards Institute Customer Service
11 West 42nd St.
New York, NY 10036 http://web.ansi.org document ISO 2108:1992
The UPC/EAN checksum character
The last character in a
Checksum calculation for UPC-A, EAN-13 and EAN-8
Use Worth Data's phone number (it's not a real
18314589938
Assign even and odd positions, starting at the right and moving left:
8 | 3 | 9 | 9 | 8 | 5 | 4 | 1 | 3 | 8 | 1 |
odd | even | odd | even | odd | even | odd | even | odd | even | odd |
1.Starting with the leading digit, 8, take the sum of all the characters in the odd positions.
8 + 9 +8 + 4 + 3 + 1 = 33
2. Multiply the result of step 1 by 3.
33 x 3 = 99
3.Now take the sum of all the
3 + 9 + 5 + 1 + 8 = 26
4.Add the result in Step 2 to the result in Step 3.
99 + 26 = 125
5. Subtract the result from the next higher multiple of 10.
Next higher multiple of 10 over 125 = 130
130 - 125 = 5
5 is the
becomes:
183145899385.
