Book Spine Width Calculator
Estimate paperback spine width.
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Copy or share after running the tool. Saved tools and settings stay in this browser.
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Estimate book spine width
Book covers need a spine width that matches page count, paper stock and binding. Enter page count, pages per inch and cover thickness to estimate the spine width in inches and millimeters. It is useful for paperback covers, print-on-demand layouts, journals, workbooks and proof planning.
Use printer stock data
Pages per inch depends on paper thickness and binding method, so use the value supplied by your printer whenever possible.
Frequently asked questions
What is pages per inch?
It is how many pages fit into one inch of text block thickness for a given paper stock.
Does this guarantee printer approval?
No. It is an estimate. Always follow the printer template.
Does cover thickness matter?
Yes. The optional cover thickness field adds a small amount to the estimate.