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Free KDP tools for puzzle book publishers

Seven calculators for the numbers every paperback needs, each with a live preview of your book at the specs you enter. No sign-up, and the math is the same engine our Book Studio prints with.

Royalty calculatorPrinting cost, royalty per sale and break-even price for any marketplace, plus Etsy, Gumroad, TPT, IngramSpark and Payhip side by side.Open Page count calculator
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How many pages your puzzles fill, with answer keys and front matter, and whether the book clears KDP's 24-page minimum.Open Cover size calculatorFull-wrap cover width and height with bleed, spine and safe zones, plus a free downloadable PNG cover template.Open Spine width calculatorSpine width from page count and paper type, and whether KDP lets you print text on it.Open Margin calculatorInside (gutter) and outside margins for your trim and page count, drawn on a facing-page spread.Open Barcode safe zoneExactly where KDP prints the barcode on your back cover, measured from the trim and from the wrap edge.Open Large print checker
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Is your font size really large print, and how big a puzzle grid fits at that size on your trim.Open

One page count, many numbers

Almost every KDP paperback spec flows from the page count. It sets the spine width, which sets the full cover size. It sets the minimum inside margin, which grows as the book gets thicker. It sets the printing cost, which decides your royalty and the lowest price KDP will accept. Get the page count wrong and the cover gets rejected, the margins fail review, or the price earns less than you think.

These tools work through that chain in order. Plan the puzzles with the page count calculator, price the book with the royalty calculator, then size the cover, check the spine, the margins and the barcode area. If you are making a large-print edition, the large print checker tells you how big a grid fits at your chosen size before you build anything.

Every calculator draws your book as you type: the spine at its real thickness, the full cover wrap with bleed and safe zones, a facing-page spread with margins, or a strip of every page in the interior. When the numbers look right, the button on each tool opens the Book Studio with those specs already filled in.

Frequently asked questions

Are these KDP calculators free?

Yes. Every tool on this page is free, needs no account and works in your browser. They use the same KDP print math as PuzzlePage's Book Studio, which builds complete puzzle book interiors and covers.

How accurate are the numbers?

Spine width, cover size, margins, bleed and the barcode area follow KDP's published paperback specifications exactly. Royalties use KDP's printing cost table checked in September 2026. The page count and large print tools are estimates by nature, and the Book Studio reports exact figures once a book is built.

Which tool should I use first?

Start with the page count calculator if you are planning a puzzle book, because page count drives the spine, the cover size, the margins and the printing cost. Then use the royalty calculator to set a price and the cover size calculator to get a template.

Can I share a result?

Yes. Each calculator keeps its settings in the page address after the # sign, so copying the link from your browser shares exactly what you see.

Every free PuzzlePage tool

All free, no signup, and they run in your browser.