ISBN-10 to ISBN-13 Converter
Enter a valid ISBN-10 (digits, with optional final X) to get the ISBN-13.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator converts an older 10-digit ISBN into the current 13-digit standard by prefixing it with 978 — the GS1 prefix that brought books into the same barcode system as retail products — dropping the original ISBN-10 check digit, and computing a brand-new one using the EAN-13 weighted mod-10 algorithm (alternating ×1/×3 weights, check digit = (10 − sum mod 10) mod 10).
Every book published before 2007 originally carried only an ISBN-10, so publishers, libraries and online booksellers rely on this exact conversion to catalogue older titles correctly under the ISBN-13 standard now required for barcodes and metadata.
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