Free KDP tools and calculators
9 free calculators for Amazon KDP, 3 printable puzzle makers and 5 references: KDP’s rejection messages, the 2026 rule changes, the 47 languages KDP supports, the rulebook as open data and a royalty and printing cost index of 21 common formats. Every number comes from the rulebook our layout engine uses, checked against KDP Help; the puzzle makers run the generators our puzzle books use.
Calculators
- 200 pages, white: 0.45 in
Spine width calculator
Spine width from page count and paper, with the spine-text rule.
Open the calculator → - 6 × 9 in, 200 pages: 12.7 × 9.25 in
Cover size calculator
Full-wrap cover size and a downloadable PNG or SVG template with every guide.
Open the calculator → - 6 × 9 in, 200 pages: $3.40
Printing cost calculator
Printing cost at 2026 rates and the minimum list price on all 14 print marketplaces, by page count.
Open the calculator → - at $12.99: $4.39
Royalty calculator
Royalty per sale: print 50/60%, Kindle 35%, or 70% from $2.99 to $12.99 since July 7, 2026.
Open the calculator → - paperback trims: 16 + custom
Trim sizes
All standard trims to scale, with page limits per ink and paper.
Open the calculator → - gutter, 200 pages: 0.5 in
Margins & bleed
Gutter by page count, outside margins and the page size with bleed.
Open the calculator → - KDP issues recognized: 26
Rejection decoder
Paste KDP's email and see each issue it reports, with the fix.
Open the calculator → - 80,000-word novel, 6 × 9 in: 242 pages
Word count to page count
Book pages from a word count or from Word / Google Docs pages, by trim and font size.
Open the calculator → - description, tags included: 4,000 chars
Description formatter
Bold, italics, headings and lists in the HTML KDP accepts, with a live character count.
Open the formatter →
Printable puzzle makers
- printable grids: 8×8 → 22×22
Word search maker
A printable word search from your own words, with its answer key.
Open the maker → - one solution each: 4×4 · 6×6 · 9×9
Sudoku maker
Printable sudoku from easy to expert, each with one solution.
Open the maker → - with the solution: Rectangle · Circle
Maze maker
Printable rectangular or circular mazes, with the solution.
Open the maker →
KDP references
- messages explained: 26
Rejection messages
What 26 KDP messages mean and how to fix each one.
Open the reference → - 70% band change: Jul 7, 2026
Rule changes
22 dated, sourced KDP rule changes since 2023, newest first.
Open the reference → - languages on KDP: 47
Supported languages
All 47 KDP languages, by eBook, paperback and hardcover.
Open the reference → - open data, CC BY 4.0: JSON · CSV
Open KDP data
The KDP rulebook as JSON and CSV, free to reuse with credit.
Open the reference → - formats × marketplaces: 21 × 14
Royalty and printing cost index
21 common formats on every marketplace: printing cost, minimum price and royalty, as CSV.
Open the reference →
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:
- 80+ 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 created + 2 submitted per format / week, per KDP Help
- Languages:
- 47 · 44 for Kindle
Turn the numbers into files: the KDP formatting tool lays out your manuscript to these rules, and the AI book cover creator for KDP sizes and designs the full-wrap cover from your page count.
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.
2,000 free credits · no card required