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Free tool

Spine Calculator

Calculate the exact spine thickness for your book or magazine to properly prepare the cover artwork.

Book details

Equals 100 pages (each sheet prints on both sides)
Perfect-binding hot melt usually adds 0.3 to 1 mm. Adjust it to your machine.

Result

Spine 5.94 mm

Side view

FRONT COVER
BACK COVER
5.0 mm Sheet block
0.44 mm Covers (x2)
0.5 mm Glue

If you measure the stack with a ruler or caliper, compare it against the sheet block: covers and glue are added afterwards.

Tip Add a 2mm safety margin to the cover design. The final spine with margin would be 7.94 mm.

Book spine width calculator (pages to spine size)

This spine calculator gives you the exact spine width for your book, magazine or catalog based on the page count, the paper type and its weight (gsm). It is the key number for designing a full cover (back + spine + front) so the spine text is centered and never gets cut during binding.

Free, no sign-up. Works for perfect binding (glued) and hardcover. Get the spine size right the first time and avoid reprints.

1
Enter the page count

Count all interior pages (one sheet = 2 pages).

2
Pick paper type and weight

e.g. 90 gsm bond, 150 gsm coated. Heavier paper = thicker spine.

3
Get the spine width

The tool returns the thickness in millimeters for your artwork.

4
Design your cover

Back + spine + front, with the spine title centered.

Preguntas frecuentes

Multiply the number of sheets by the thickness of each sheet (which depends on paper weight and type). This calculator does it automatically from your page count and paper.