Free tools for authors

Explore the best free tools for authors to work out what a book earns, how many pages it makes and when it pays for itself.

Navid Moazzez built every one of them, so you can check the numbers for KDP, Apple Books, Kobo and more before you publish.

Updated Sept 29, 2026

Book royalty calculator

What you earn per copy at KDP, Apple Books, Kobo, B&N, Google Play and Audible.

KDP royalty calculator

Your Amazon KDP royalty for eBook, paperback and hardcover, with the price where it jumps.

Book profit calculator

When your book pays for itself: costs in, break-even out, at your own sales pace.

Book ROI calculator

What a book is worth to your business: royalties plus the clients it brings.

Book page count calculator

Your page count at a real trim, font and margins, with spine width and printing cost.

Words to pages calculator

How many pages your words make, in 10 book fonts and 6 trim sizes.

Book length calculator

How long bestsellers in your genre are, how your book compares, and when you'll finish.

Reading time calculator

How long pages, words, a text or a book take to read, at real reading speeds.

How many books can I read in a year

How many books you'll read in a month and a year, from your minutes a day.

KENP calculator

What Kindle Unlimited pays per full read of your book and per month, beside a sale.

ISBN barcode generator

A print-ready ISBN barcode with its price code, as SVG, PDF or PNG, scan-checked.

Reading speed test

Your reading speed in words a minute, checked with three questions.

Book title generator

Title ideas shaped like your genre's bestsellers, tested against KDP's rules and books that have them.

Book subtitle generator

Subtitles that state your book's promise, at the length your genre's bestsellers use.

Book royalty calculator

What you earn per copy at KDP, Apple Books, Kobo, B&N, Google Play and Audible.

KDP royalty calculator

Your Amazon KDP royalty for eBook, paperback and hardcover, with the price where it jumps.

Book profit calculator

When your book pays for itself: costs in, break-even out, at your own sales pace.

Book ROI calculator

What a book is worth to your business: royalties plus the clients it brings.

Book page count calculator

Your page count at a real trim, font and margins, with spine width and printing cost.

Words to pages calculator

How many pages your words make, in 10 book fonts and 6 trim sizes.

Book length calculator

How long bestsellers in your genre are, how your book compares, and when you'll finish.

Reading time calculator

How long pages, words, a text or a book take to read, at real reading speeds.

How many books can I read in a year

How many books you'll read in a month and a year, from your minutes a day.

KENP calculator

What Kindle Unlimited pays per full read of your book and per month, beside a sale.

ISBN barcode generator

A print-ready ISBN barcode with its price code, as SVG, PDF or PNG, scan-checked.

Reading speed test

Your reading speed in words a minute, checked with three questions.

Book title generator

Title ideas shaped like your genre's bestsellers, tested against KDP's rules and books that have them.

Book subtitle generator

Subtitles that state your book's promise, at the length your genre's bestsellers use.

Book royalty calculator

What you earn per copy at KDP, Apple Books, Kobo, B&N, Google Play and Audible.

KDP royalty calculator

Your Amazon KDP royalty for eBook, paperback and hardcover, with the price where it jumps.

Book profit calculator

When your book pays for itself: costs in, break-even out, at your own sales pace.

Book ROI calculator

What a book is worth to your business: royalties plus the clients it brings.

Book page count calculator

Your page count at a real trim, font and margins, with spine width and printing cost.

Words to pages calculator

How many pages your words make, in 10 book fonts and 6 trim sizes.

Book length calculator

How long bestsellers in your genre are, how your book compares, and when you'll finish.

Reading time calculator

How long pages, words, a text or a book take to read, at real reading speeds.

How many books can I read in a year

How many books you'll read in a month and a year, from your minutes a day.

KENP calculator

What Kindle Unlimited pays per full read of your book and per month, beside a sale.

ISBN barcode generator

A print-ready ISBN barcode with its price code, as SVG, PDF or PNG, scan-checked.

Reading speed test

Your reading speed in words a minute, checked with three questions.

Book title generator

Title ideas shaped like your genre's bestsellers, tested against KDP's rules and books that have them.

Book subtitle generator

Subtitles that state your book's promise, at the length your genre's bestsellers use.

Book royalty calculator

What you earn per copy at KDP, Apple Books, Kobo, B&N, Google Play and Audible.

KDP royalty calculator

Your Amazon KDP royalty for eBook, paperback and hardcover, with the price where it jumps.

Book profit calculator

When your book pays for itself: costs in, break-even out, at your own sales pace.

Book ROI calculator

What a book is worth to your business: royalties plus the clients it brings.

Book page count calculator

Your page count at a real trim, font and margins, with spine width and printing cost.

Words to pages calculator

How many pages your words make, in 10 book fonts and 6 trim sizes.

Book length calculator

How long bestsellers in your genre are, how your book compares, and when you'll finish.

Reading time calculator

How long pages, words, a text or a book take to read, at real reading speeds.

How many books can I read in a year

How many books you'll read in a month and a year, from your minutes a day.

KENP calculator

What Kindle Unlimited pays per full read of your book and per month, beside a sale.

ISBN barcode generator

A print-ready ISBN barcode with its price code, as SVG, PDF or PNG, scan-checked.

Reading speed test

Your reading speed in words a minute, checked with three questions.

Book title generator

Title ideas shaped like your genre's bestsellers, tested against KDP's rules and books that have them.

Book subtitle generator

Subtitles that state your book's promise, at the length your genre's bestsellers use.

Browse the best free tools for authors

19 tools

Book royalty calculator

What you earn per copy at KDP, Apple Books, Kobo, B&N, Google Play and Audible.

KDP royalty calculator

Your Amazon KDP royalty for eBook, paperback and hardcover, with the price where it jumps.

Book profit calculator

When your book pays for itself: costs in, break-even out, at your own sales pace.

Book ROI calculator

What a book is worth to your business: royalties plus the clients it brings.

Book page count calculator

Your page count at a real trim, font and margins, with spine width and printing cost.

Words to pages calculator

How many pages your words make, in 10 book fonts and 6 trim sizes.

Book length calculator

How long bestsellers in your genre are, how your book compares, and when you'll finish.

Reading time calculator

How long pages, words, a text or a book take to read, at real reading speeds.

How many books can I read in a year

How many books you'll read in a month and a year, from your minutes a day.

KENP calculator

What Kindle Unlimited pays per full read of your book and per month, beside a sale.

ISBN barcode generator

A print-ready ISBN barcode with its price code, as SVG, PDF or PNG, scan-checked.

Reading speed test

Your reading speed in words a minute, checked with three questions.

Book title generator

Title ideas shaped like your genre's bestsellers, tested against KDP's rules and books that have them.

Book subtitle generator

Subtitles that state your book's promise, at the length your genre's bestsellers use.

Book description generator

3 Amazon book descriptions from your pitch, each checked against KDP's rules.

Amazon book description formatter

Format your book description for Amazon, Editorial Reviews, Kobo or Barnes & Noble, checked and previewed.

Book outline generator

A chapter-by-chapter outline from a proven structure, with word targets, as Word or Markdown.

Writing prompt generator

Writing prompts for fiction, memoir, nonfiction and posts, or from your own book's outline.

Book finder

The best books to read, searchable by what you want to learn, with my picks and summaries.

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