Publishing & media
ISBN-10 & ISBN-13 Validator / Check-Digit Calculator
Validate ISBN-10 and ISBN-13 numbers or calculate a missing check digit from 9 or 12 digits. Nothing you enter leaves your browser.
Enter your values, then calculate.
What this tool does
About the ISBN-10 & ISBN-13 Validator / Check-Digit Calculator
Validate ISBN-10 and ISBN-13 numbers or calculate a missing check digit from 9 or 12 digits. It helps translate production specifications into practical dimensions, durations, or file-size estimates.
The tool checks the supplied value and reports validation details so you can correct the source rather than guessing where it failed.
How to use it
- Review the starting values for isbn (hyphens and spaces are allowed) and replace them with your own.
- Choose any available units or assumptions, then select “Check ISBN.”
- Read the labeled result, compare another scenario if needed, and copy the output for your notes.
Practical example
Start with a known input
The workbench starts with a complete scenario: ISBN (hyphens and spaces are allowed): 978-0-306-40615-7 Change one assumption at a time to see how it affects the result.
What to know about the result
- Results are estimates based only on the supplied values. Rounding, fees, local rules, and real-world conditions may change the final outcome.
Common questions
Using the ISBN-10 & ISBN-13 Validator / Check-Digit Calculator
Is the ISBN-10 & ISBN-13 Validator / Check-Digit Calculator free to use?
Yes. FormatCalc's ISBN-10 & ISBN-13 Validator / Check-Digit Calculator is free to use with no account required.
Is my data private when I use the ISBN-10 & ISBN-13 Validator / Check-Digit Calculator?
Yes. This tool processes your input locally in your browser. FormatCalc does not upload or store what you enter.
How do I use the ISBN-10 & ISBN-13 Validator / Check-Digit Calculator?
Enter your values, select any units, and choose Check ISBN. You can then copy the result.
What should I check before using the result?
Results are estimates based only on the supplied values. Rounding, fees, local rules, and real-world conditions may change the final outcome.