Free tools for KDP publishers

Calculators for the numbers every Amazon KDP paperback needs — spine width, cover size, printing cost, and royalty — built on KDP's published specs. All free, no signup.

KDP calculators

KDP spine width & cover size calculator

Exact spine width and full cover dimensions with bleed for any page count, paper, and trim — in inches, mm, and pixels.

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KDP royalty calculator

Amazon.com printing cost, royalty rate, and royalty per paperback sale — plus your break-even list price.

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Free coloring page generators

Free AI coloring page

Describe a scene and get one printable coloring page. No signup, no card.

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Free coloring pages

Hundreds of free printable coloring pages, sorted by theme.

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Making a whole book?

ColorCraft generates the interior pages, the spine-aware cover wrap, and listing mockups for coloring books, storybooks, and puzzle books in one workflow.

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