Terms of Use

Last updated 2026-10-16

The calculators on Book Math Tools are free to use. They are provided as they are, for information only, and based on rates published by Amazon KDP at the date shown on each page. Rates can change without notice.

We work hard to keep every number correct, but we can't guarantee it. Always confirm final dimensions, costs and royalties in KDP before you publish or set prices. We are not liable for losses from relying on these tools.

Book Math Tools is not affiliated with Amazon. Amazon, Kindle, KDP and Kindle Unlimited are trademarks of Amazon.com, Inc. or its affiliates.

You may link to any page on this site. Please don't copy the calculators or text onto another website.