Free tools

Free book-cover tools

Four calculators for print-ready books. No signup. The cover-size calculator runs here; the spine, page-count and royalty calculators live on our sister site Book Maker, same account, same wallet.

Cover Maker toolCover size calculatorExact full-wrap and ebook cover dimensions for your trim, pages and paper, drawn to scale.Open →Read: KDP cover size requirements

Book Maker toolSpine width calculatorPage count and paper to the spine width your cover wrap needs, in inches and millimetres.Open →Read: the spine text rules

Book Maker toolPage count estimatorTurn a word count into printed pages by trim size and type size.Open →Read: choosing a trim size

Book Maker toolKDP royalty calculatorList price and page count to Amazon's printing cost and what you keep per copy.Open →Read: cream vs white paper

OONA Cover Maker

One-click covers, print-ready

Front, spine and back — a full wrap-around cover sized exactly for KDP, plus a matching Kindle edition. All the design tools you need for instant, print-ready art. Free preview, no card.

Make your cover →

Prefer not to do any of this by hand? The cover studio computes every dimension automatically and exports print files for KDP and Lulu perfect-bound paperbacks. IngramSpark and B&N use the exact spine width from their official cover templates.