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Subject Topic: How ISBN Checksum works Post ReplyPost New Topic
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glitch
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Joined: January 25 2003
Location: Canada
Posts: 280
Posted: November 30 2003 at 12:05pm | IP Logged Quote glitch

How ISBN Checksum works

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/utility/upc-ean.asp#ISBN



Edited by viceroy on November 30 2003 at 6:18pm
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