Free calculators for Amazon KDP.
Spine width, cover size, printing cost, royalties, trim sizes and margins, computed from the same KDP rulebook our layout engine uses to build books. Every number is checked against KDP Help and KDP’s own calculators.
- 01200 pages, white0.45 in
Spine width calculator
Spine width from page count and paper, with the spine-text rule.
Open the calculator → - 026 × 9 in, 200 pages12.7 × 9.25 in
Cover size calculator
Full-wrap cover size and a downloadable template with every guide.
Open the calculator → - 036 × 9 in, 200 pages$3.40
Printing cost calculator
Printing cost and minimum list price on all 14 print marketplaces.
Open the calculator → - 04at $12.99$4.39
Royalty calculator
Royalty per sale for print (50/60%) and Kindle (35/70% with delivery).
Open the calculator → - 05paperback trims16 + custom
Trim sizes
All standard trims to scale, with page limits per ink and paper.
Open the calculator → - 06gutter, 200 pages0.5 in
Margins & bleed
Gutter by page count, outside margins and the page size with bleed.
Open the calculator →
KDP numbers at a glance
The rules that shape every KDP book, as of September 26, 2026. Each calculator explains where its numbers come from.
- Paperback trim sizes
- 16 + custom
- Paperback pages
- 24–828
- Hardcover pages
- 75–550
- Bleed
- 0.125 in · 3 sides
- Gutter
- 0.375 → 0.875 in
- Outside margin
- 0.25 in · 0.375 in with bleed
- Spine, cream paper
- 0.0025 in / page
- Spine text
- 79+ pages
- Barcode area
- 2 × 1.2 in
- Image resolution
- 300 DPI
- Print royalty (US)
- 60% from $9.99
- Kindle 70% band (US)
- $2.99–$12.99
- Kindle cover
- 1600 × 2560 px
- New titles
- 2 per format / week
Or let kdpbook do all of it.
Describe your book and get the interior PDF, the cover PDF and the Kindle eBook with every one of these rules applied, page by page.
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