How to calculate spine width

The spine calculations are for most people a confusing element. For the most cases, our client will implement the calculations directly into their system. For that, we provide the formulas for the calculations.

Formula for spine width calculation


mm

Spine in mm = (paperweight in gsm x paper bulk x (page count / 2)) / 1000 + (2 x cover thickness)

inch

Spine in inch = ((paperweight in gsm x paper bulk x (page count / 2)) / 1000 + (2 x cover thickness)) / 25.4

The paper bulk values used by Cloudprinter is:

Paper type Bulk value
MCG 0.80
MCS 0.90
ECB 1.20
OFF 1.22

The cover thickness values used by Cloudprinter is:

Cover type Thickness in mm
Case Wrap / Hardcover - 3 mm material (default) 3.0
Case Wrap / Hardcover - 2 mm material 2.0
Perfect Binding / Softcover 0.5

Spine width calculator


We have made a guideline tool for you to easily calculate the spine based on the paperweight, paper type, and cover type.

You find the calculator here: Spine width calculator

Disclaimer


This spine width calculation uses average bulk values. The characteristics of the paper used by different print partners may vary.

Case Wrap books mostly use pre-cut cardboard in the spine. The cardboard is therefore in a number of fixed sizes. These sizes may vary between print partners.