Free KDP calculators and checkers

Small tools for the numbers and rules every KDP book runs into. They follow Amazon's published KDP rules, link to the pages they come from, and need no account. Code is open on GitHub.

• KDP royalty and printing cost calculator

  Royalty per sale for paperback, hardcover and Kindle ebooks on Amazon.com, with printing cost, minimum list price and the $9.99 cliff.

• KDP paperback cover size and spine width calculator

  Full-wrap cover size in inches, millimetres and 300 DPI pixels, spine width by paper type, and whether spine text is allowed.

• Kindle ebook price checker

  Checks a US list price against the 35% and 70% royalty bands, the file-size minimums and the 20%-below-print rule.

• KDP book description formatter and checker

  Turns plain text into KDP-safe HTML and flags length, unsupported tags, unclosed tags, links, prices, reviews and emojis.

• KDP keyword slot checker

  Checks your seven keyword slots against Amazon's list of keywords to avoid and finds words wasted on repeats.

• KDP category finder

  Describe your book or paste an ASIN and get matching Amazon categories with the KDP path, list size and median price. Data from KDPTop.

• Amazon BSR to sales estimator

  Rough daily and monthly sales for an Amazon.com Best Sellers Rank, for books and Kindle ebooks. An order-of-magnitude estimate.