Posters & Booklets
Book Spine Width Calculator
Estimate book spine width from page count, paper thickness, and cover thickness.
Book Spine Width Calculator
Estimate spine width from page count and paper thickness.
Total interior pages.
Use GSM estimate or exact thickness.
80 gsm is common office paper.
One cover side thickness in mm.
Ready to calculate
Adjust the inputs, then click Start. Change values and click Start again whenever you want a fresh result.
Spine width is only an estimate
Actual paper thickness varies by stock, coating, humidity, and printer. Always use the printer's final specification for production covers.
How to use this tool
- Enter total page count.
- Enter paper thickness or estimate from GSM.
- Add cover thickness if needed.
Common use cases
- Paperback covers
- Book mockups
- Print planning estimates
Frequently asked questions
Should I trust this instead of my print shop?
Use these calculators for planning, then confirm final requirements with your printer or print shop.
Do these tools upload my files?
No. The calculators use typed dimensions and run in your browser. They do not upload images or documents.