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Small tools for the decisions around the book

Run the numbers and check the publishing details before you commit. Assumptions stay visible and editable.

Kindle Royalty Calculator

Compare 35% and 70% royalty estimates.

Model page-read earnings with your own rate.

Add editing, design, formatting and launch costs.

Pressure-test price against length and format.

Estimate pages across common book formats.

Compare channel fees with editable assumptions.

Classify your workflow with three clear questions.

Test reader, outcome, authority, demand and difference.

Turn a book-length target into a usable chapter plan.

See contribution per sale and the sales needed to break even.

Calculate paperback spine and full-wrap cover dimensions.

Check whether your listing has the essential reader-facing fields.

Turn target length and daily capacity into a realistic schedule.

Model visits, conversion, fees and launch spend together.

Score a Kindle niche from six things you read off one search page.