How ISBN Checksum works

topics related to linear barcode formats such as Code 39, Code128, Interleaved 2 of 5 (ITF25), UCC/EAN-128, UPC-A, UPC-E, EAN-13, EAN-8, GS1 Databar etc.

How ISBN Checksum works

Postby glitch (legacy member) on Sun Nov 30, 2003 12:05 pm

http://www.morovia.com/education/symbology/isbn.asp

An ISBN number consists of 9 digits, followed by a checksum, which is a digit from 0 to 9, or an X. There may be dashes among the digits at seemingly random places.
The checksum is calculated as follows:

The first 9 digits are multiplied by their position, and these numbers are summed up. Ie, the sum is first digit * 1 + second digit * 2 + ... + 9th digit * 9

The remainder mod 11 is used as the checksum (X is used to represent 10).

A web utility can be found on Morovia web site: http://www.morovia.com/education/utilit ... n.asp#ISBN
glitch (legacy member)
 

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