About this calculator

Spine width = pages / 2 × PPI factor. Common EU GSM: 80 gsm bond ≈ PPI 17; 100 gsm ≈ PPI 14; 120 gsm ≈ PPI 12.

Frequently asked questions

What does the Book Spine Width & Paper Calculator do?

Spine width and paper weight for perfect-bound books (EU GSM). Spine width = pages / 2 × PPI factor. Common EU GSM: 80 gsm bond ≈ PPI 17; 100 gsm ≈ PPI 14; 120 gsm ≈ PPI 12.

Is the Book Spine Width & Paper Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Book Spine Width & Paper Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified bookbinding & print professional before committing to a purchase or a job.

What inputs does the Book Spine Width & Paper Calculator need?

Enter values for: Pages (inc blanks), Paper GSM, Trim size. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Book Spine Width & Paper Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.