Skip to content

Book Signature Calculator

Calculate signatures, sheets, and spine width for bookbinding. Supports perfect, case, saddle stitch, and coptic binding.

Inputs

Will round up to fill signatures

GSM
in
in

Results

Total Signatures

13 signatures (8 leaves each)

Total Leaves

104 leaves (208 pages)

Spine Width

9.9 mm

Text Block Thickness9.2 mm
Cover Board Size6.12" × 9.24" (3mm overhang)
Rounded from 200 to 208 pages (8 blank pages added)

Track real costs and manage Bookbinding production in Artisan — free forever, no credit card

Start Free

Tips

1
16 pages per signature is the most common for case binding. Thinner signatures drape better.
2
Test fold a signature with your paper before committing — thick paper may not fold cleanly at 32 pages.

Open formula

Signatures = ⌈Total Pages / Pages Per Sig⌉
Spine Width = Total Sheets × Paper Caliper
Board Overhang = 3mm on head, tail, and fore-edge

Calculates number of signatures, total sheet count, and spine dimensions for bookbinding. Paper caliper derived from GSM.

Want a copy of your results?

Email yourself a summary. No account required.

Your entire craft operation for $0 – $4.99/mo. Self-funded, so prices stay honest. Free tier forever. No credit card required.

See pricing →

From calculator to production

Save results, track costs

This calculator is built into every Bookbinding workspace. Save calculations to your workspace, email results, and access all 25+ calculators. Free forever on the $0 plan. No credit card required.