There are standard rules for converting an ISBN-10 into an ISBN-13. See Conversions & Calculations for a complete listing of these conversion rules.

     Begin with any 10-digit ISBN:          094001685-0

     Eliminate the check digit:                094001685-

     Add the prefix '978':                  978-094001685-

     Calculate a new check digit:      978-094001685-9

     The ISBN-10:                                 094001685-0

     Converts to the ISBN-13:          978-094001685-9

Several online calculators have been developed for those who do not wish to convert ISBNs on their own.

ONLINE ISBN CONVERTERS:

For the U.S. ISBN Agency online converter, click here.

For the International ISBN Agency online converter, click here.

For the Library of Congress online converter, click here.

To check the accuracy of an ISBN's check digit, see UCC Check Digit Calculator.

NOTE:

Any ISBN-13 prefixed with '978' can be converted to an ISBN-10.

There is no ISBN-10 equivalent, however, for an ISBN-13 beginning with '979'.