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Free KDP calculators
Work out cover size, spine width, margins and royalties for an Amazon KDP paperback. No account needed. Every tool uses the formulas on KDP's own help pages.
Cover size calculator
Full-wrap cover size, spine width and pixels at 300 DPI, with a to-scale diagram.
Open the tool →Spine width calculator
Spine width for any page count and paper, and whether KDP allows spine text.
Open the tool →Royalty & printing cost
Printing cost, royalty per copy and the lowest list price for a paperback.
Open the tool →Margins & bleed
Inside and outside margins by page count, and the page size to set with bleed.
Open the tool →KDP paperback numbers in one place
The rules that decide whether a file passes review.
| Rule | KDP paperback |
|---|---|
| Minimum page count | 24 pages for every paperback |
| Bleed | 0.125 in on the top, bottom and outside edges |
| Large trim | Wider than 6.12 in or taller than 9 in |
| Outside margins | 0.25 in minimum, 0.375 in with bleed |
| Inside margin | 0.375 in to 0.875 in, by page count |
| Spine per page | 0.002252 in white, 0.0025 in cream, 0.002347 in premium color |
| Spine text | Only on books with more than 79 pages |
| Image resolution | At least 300 DPI |
| Font size | At least 7 pt, fonts embedded |
| Barcode area | 2 × 1.2 in, lower right of the back cover |
| Royalty (Amazon.com) | 60% at $9.99 and up, 50% below, minus printing |
| Title limits | Weekly limits per format, reset Sundays at 00:00 UTC |
- KDP Help: Set trim size, bleed and margins
- KDP Help: Paperback submission guidelines
- KDP Help: Create a paperback cover
- KDP Help: Paperback royalty
- KDP Help: Paperback printing cost
- KDP Help: Barcodes
Checked against KDP's help pages on 6 November 2026. KDP changes its rules from time to time, so confirm anything important on KDP's own pages before you publish. Bookhatch is not affiliated with Amazon.
What the numbers mean
KDP paperback specs: trim size, paper, bleed and margins
Trim sizes and page limits, the four ink and paper options, bleed, margins by page count, spine width and image rules.
Read the guide · 10 min →PublishingKDP paperback royalties and printing costs, with worked examples
The 50% and 60% rates, printing cost formulas, the $9.99 threshold and worked examples for every book type.
Read the guide · 8 min →PublishingHow to make and publish a coloring book on KDP
Niche, trim size, line art that prints cleanly, single-sided pages, the cover, pricing and the KDP listing.
Read the guide · 9 min →Skip the calculator next time
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