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• Shortlists
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• Compare any tools side by side
• Monthly market reports
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• Open data
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• About KDP123

Feeds and data

• XML sitemap
• RSS: all updates
• RSS: price changes
• RSS: monthly reports
• JSON Feed
• Tools as JSON
• Tools as CSV
• llms.txt

Free calculators

• KDP royalty and printing cost calculator
• Kindle ebook price checker
• KENP page-read earnings calculator
• Amazon Ads break-even ACoS calculator for books
• KDP royalty payment date countdown
• Amazon BSR to sales estimator
• KDP paperback cover size and spine width calculator
• Word count to page count calculator
• KDP interior margin and gutter calculator
• ISBN validator, converter and barcode
• KDP title and subtitle length checker
• KDP keyword slot checker
• KDP keyword builder
• KDP book description formatter and checker
• KDP category finder
• KDP pre-order and release date deadline calculator

Shortlists and comparisons

• Best free and one-time KDP tools: no subscriptions
• Best KDP keyword and category research tools
• Best KDP tools for beginners: what a first book needs
• Best KDP tools for romance and fiction authors
• Best tools for KDP coloring, puzzle and low-content books
• Book Bolt vs BookBeam
• Publisher Rocket vs KDSPY
• Vellum vs Atticus

Reports

• KDP market report, November 2026

KDP facts

Royalties & payments

• KDP ebook royalties: the 35% and 70% options
• KDP hardcover royalties: 60% or 50% minus printing cost
• KDP paperback royalties: 60% or 50% minus printing cost
• When and how KDP pays royalties: schedule, thresholds, methods

Print books

• Can you put a KDP paperback or hardcover on pre-order?
• How KDP calculates paperback and hardcover printing costs
• KDP bleed size and minimum margins by page count
• KDP Expanded Distribution: eligibility, royalty and restrictions
• KDP minimum and maximum page counts by format, paper and ink
• KDP paperback cover size and spine width by page count
• KDP proof copies and author copies: cost, limits and how to order
• KDP trim sizes for paperback and hardcover books

Ebooks

• KDP ebook file formats: manuscript and cover requirements
• KDP ebook pre-orders: lead time, final file deadline and penalties
• KDP ebook pricing rules: minimum, maximum and price matching

KDP Select & programs

• KDP Select rules: exclusivity, renewal, Kindle+ and promotions
• KENP royalties: how KDP pays for Kindle+ pages read

Content rules

• KDP AI content disclosure: AI-generated vs AI-assisted
• KDP low-content books: definition, ISBN option and limits
• Publishing public domain books on KDP: differentiation and royalties

Metadata & listing

• A+ Content for KDP books: where to create it and what's allowed
• KDP book description rules: 4,000 characters and supported HTML
• KDP ISBN rules: free KDP ISBN vs your own, and ebooks
• KDP keywords and categories: 7 keywords, 3 categories
• KDP title, subtitle, series and contributor rules, plus title limits

Account & tax

• KDP tax interview (tax profile): W-8, withholding and treaties