Resources Size it right Free tool
Hardcover & softcover spine width calculator
Enter your page count, interior stock and binding to get the text-block thickness, finished spine and the exact spine width to set in your cover PDF.
Book spine calculator
Text block
0.540"
13.7 mm · ≈ 17/32" · leaves × caliper
Finished spine
0.736"
18.7 mm · ≈ 24/32" · block + 2 boards
Cover-art spine width
0.798"
20.3 mm · ≈ 26/32" · incl. hinge allowance
240 pages = 120 leaves × 0.0045" caliper. Boards: 2 × 0.098". Results are a pre-press estimate; final spine is confirmed on your proof.
Designers & agencies: put this calculator on your own site — free, always up to date.
More in “Size it right”
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Booklet Page Planner
Rounds your page count to a printable multiple of four, recommends saddle stitch vs perfect binding for your paper, and gives the spine thickness and creep so your layout is right first time.
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