[Web4lib] Conversion between ISBN-10 and ISBN-13

[Ted Koppel]

Patricia Anderson, pfa at umich.edu  wrote:
>  To go from 13 to 10 is easy -- the isbn-10 is the last 10 digits of
the isbn-13. Going the other direction, I haven't >>>figured out yet
(not that I've tried hard).

Actually, that's not so.  You need to recalculate the check digit.  So
take the last 10 digits, drop the tenth, and recalculate the new check
digit to replace it.  The check digit algorithm is in the (old) ISBN
standards document and various places online.

Ted



-----Original Message-----
From: web4lib-bounces at webjunction.org
[mailto:web4lib-bounces at webjunction.org] On Behalf Of Patricia F
Anderson
Sent: Saturday, September 30, 2006 7:27 AM
To: David Kane
Cc: web4lib at webjunction.org
Subject: Re: [Web4lib] Conversion between ISBN-10 and ISBN-13

There is already an online converter:

<http://www.isbn.org/converterpub.asp>

They offer the service to convert large stacks.

"Need a large list of ISBNs converted? Enquire about obtaining your
converted list."

To go from 13 to 10 is easy -- the isbn-10 is the last 10 digits of thte
isbn-13. Going the other direction, I haven't figured out yet (not that
I've tried hard).

  -- Patricia Anderson, pfa at umich.edu


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