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Bookbind

Free tools

Calculators for the numbers self-publishing runs on. No signup, no email, no results held back. Every figure comes from Amazon's published rates and is checked against their own worked examples.

Money

KDP Royalty Calculator

What you actually earn per copy

Work out your exact Amazon KDP royalty per copy for ebooks and paperbacks, including the delivery fee and printing costs most calculators leave out.

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Book Pricing Calculator

Find the price that earns most

See earnings across every price point at once, including where the 70 percent royalty band ends and what a long paperback must charge to break even.

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Break-Even Calculator

How many copies pay it back

Add up what you spent on editing, covers and ads, then see how many copies you need to sell before the book pays for itself.

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Print

Spine Width and Cover Size

Exact print cover dimensions

Get the exact spine width and full wraparound cover size for a KDP paperback from your page count, paper type and trim size.

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Writing

Word Count to Pages

Words, pages and reading time

Convert words to printed pages for any trim size, and see reading time silently and aloud, plus how your length compares to standard book formats.

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Publishing

AI Disclosure Checker

Do you tick the box?

Answer three questions and find out whether Amazon KDP requires you to disclose AI-generated content, with the reasoning spelled out.

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The hard part is not the arithmetic

Every calculator here needs a book to exist before it means anything. That is the part Bookbind does: describe a book in one sentence and get a planned, written, illustrated manuscript with a cover and print-ready files, approving each step as it goes.

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