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Calculators and generators for every stage
KDP cover size & spine width calculatorGet the exact full-wrap cover size, spine width and pixel dimensions for your paperback, plus a printable template.Use the tool →KDP royalty & printing cost calculatorSee what Amazon charges to print your paperback and what you earn per sale, in print and on Kindle.Use the tool →Word count to page count calculatorTurn your word count into an estimated page count, spine width, reading time and audiobook length.Use the tool →Free ISBN barcode generatorCreate a print-ready ISBN barcode with an optional price add-on. Download it as SVG or high-resolution PNG.Use the tool →Free QR code generator for authorsMake a QR code for your book page, author website or review link, with optional tracking. Download SVG or PNG.Use the tool →Book title generatorGet title ideas for your genre using your own words, then shortlist favorites and check them on Amazon.Use the tool →Pen name generatorFind an author name that fits your genre, with initials, alliteration and family-name options.Use the tool →
FAQ
Questions about our tools
Are these author tools really free?
Yes. Every tool is free to use with no sign-up, no limits and no watermarks on downloads.
Do you store anything I type?
No. The tools run entirely in your web browser. Your word counts, prices, ISBNs and links are never sent to us.
How accurate are the KDP calculators?
They use the formulas and rates Amazon KDP publishes for Amazon.com, checked in October 2026. Amazon can change its rates, so confirm the final figures on your KDP bookshelf before you publish.
Can you help me publish my book?
Yes. We help authors write, edit, design, publish and market their books, always in the author’s own name and accounts. Start with a free consultation.