Calculators for self-published books
Spine widths, cover sizes, printing costs and royalties, worked out from the rates KDP publishes. Free, no sign-up, and every tool explains the math.
Paperback
- KDP Spine Width CalculatorSpine width from page count and paper type
- KDP Cover Size CalculatorFull wrap cover dimensions with bleed, in inches, mm and pixels
- KDP Margin and Bleed CalculatorInterior page size, gutter and outside margins
- Word Count to Page Count CalculatorHow many pages your manuscript will print to
Money
- KDP Printing Cost CalculatorPrint cost per copy for every ink, trim and marketplace
- KDP Paperback Royalty CalculatorRoyalty per copy, minimum price and price for a target royalty
- Kindle eBook Royalty Calculator35% vs 70% royalty with delivery costs and VAT
- KENP Pages Read CalculatorKindle Unlimited earnings from pages read
Files & ISBN
Why these tools
Publishing a paperback means getting a handful of numbers exactly right: the spine width for your cover, the gutter for your page count, the printing cost that comes out of every sale, and the list price where the royalty rate changes. Each calculator here uses the formulas and rate tables from KDP's own help pages, shows its working, and links to the source so you can check it.
When KDP changes its rates, the tools are updated and each page shows when its numbers were last checked.