Free tool for authors

Trim size & margin calculator.

Pick a trim size and a page count. See which printers list that size, the page size to set, the smallest margins KDP accepts, and your spine and cover sizes. No sign-up.

Use the count from your formatted PDF. Not formatted yet? .
Inside (gutter)
Outside
Top
Bottom

Who lists this size

Set your interior page to

Margins

KDP's minimums for your page count, and what your margins leave for the text.

Spine & cover

More free things for authors.

A one-page print-PDF checklist and a series-bible template. No sign-up.

Get the free downloads