Tools

Free tools for authors

Small calculators for the arithmetic that comes up between finishing a manuscript and uploading it. Each uses the printer's own published formula and shows its working, so you can check the answer rather than take it on trust.

All free, all without signing in, and none of them ask for an email address to show you the result.

The tools

  • Book spine width calculator

    Work out your paperback's spine width from the page count and paper stock, using KDP's and IngramSpark's own formulas. Free, no sign-up.

  • Word count to page count

    Estimate how many printed pages your manuscript will make, by trim size and format. Gives a realistic range rather than a false exact number.

  • Book margin calculator

    Work out the inside, outside, top and bottom margins for your book from its page count — the printer's minimum and a recommendation.

  • Print royalty calculator

    What a paperback actually earns after printing costs — for Amazon KDP and IngramSpark, with the break-even price.

Format your book with Alhora

Import your manuscript, typeset the interior, and see every page exactly as it will print. Formatting and previewing a whole book is free — a plan unlocks export.

Download Alhora free See pricing

macOS, Windows, Linux and ChromeOS. No card needed to format and preview.