ISBN Converter
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Guide
How ISBN Conversion Works
ISBN-10 and ISBN-13 identify books globally. Converting between them requires prefix adjustment and recalculating the checksum.
- ISBN-10 to ISBN-13: Prepends the 978 Bookland prefix, drops the old check digit, and calculates a modulo-10 checksum with alternating 1 and 3 weights.
- ISBN-13 to ISBN-10: Strips the 978 prefix, drops the old check digit, and calculates a modulo-11 checksum with decreasing weights (10 to 2), using X for remainder 10.
- 979 Prefix Note: ISBN-13 numbers starting with 979 cannot be converted to ISBN-10 as they exist solely in the 13-digit standard.