CalculatorBook spine width calculatorPage count and paper in; spine width, full cover size with bleed, pixels at 300 dpi and whether the spine can carry text out. KDP, IngramSpark or any printer.Calculate a spine →
Guide + estimatorBook trim size guide32 trim sizes in inches and millimetres, where KDP and IngramSpark print them, the margins and type size that suit them — and how many pages your word count makes.Open the guide →
CheckerKDP and IngramSpark cover checkerChoose your cover PDF or image: size with spine and bleed, resolution, colour and the safe zone drawn over a preview. Your file never leaves your computer.Check a cover →
Why these tools
The same numbers as the app.
These tools use the formulas and tables built into Tellurin, the book formatting app: the paper thickness that KDP and IngramSpark publish, their bleed and spine-text rules, the 32 trim sizes of the app with their margins and type sizes. Each page lists its sources.
They are free to use and to link to. Nothing you type or choose leaves your browser.
Tellurin does all of this for you while it typesets your book: the right size, the right spine, a cover ready for the printer. About Tellurin