Spine thickness

What spine thickness is needed with a certain amount of pages?

If your books contains more pages, the book naturally gets thicker. The spine of your book therefore grows as the number of pages increases. The width of your cover PDF should account for this growth.

The calculation for the total spine width is as follows: basic thickness + (extra pages / 2 x paper thickness). The basic thickness is 6 mm for hard cover books and 3 mm for soft cover books. This basic thickness is included in the basic width of the cover PDF!

You can find the paper thickness in the delivery specifications of the product. Print API will accept your cover PDF if it deviates no more than 1,5 mm from the specifcations.

Overview

Hard cover

Number of pages Extra spine thickness Total spine thickness
24-36 0 mm 6 mm
38-50 1 mm 7 mm
52-64 2 mm 8 mm
66-78 3 mm 9 mm
80-92 4 mm 10 mm
94-106 5 mm 11 mm
108-120 6 mm 12 mm
122-134 7 mm 13 mm
136-148 8 mm 14 mm
150-162 9 mm 15 mm
164-176 10 mm 16 mm
178-190 11 mm 17 mm
192-200 12 mm 18 mm

Soft cover

Number of pages Extra spine thickness Total spine thickness
24-36 0 mm 3 mm
38-50 1 mm 4 mm
52-64 2 mm 5 mm
66-78 3 mm 6 mm
80-92 4 mm 7 mm
94-106 5 mm 8 mm
108-120 6 mm 9 mm
122-134 7 mm 10 mm
136-148 8 mm 11 mm
150-162 9 mm 12 mm
164-176 10 mm 13 mm
178-190 11 mm 14 mm
192-200 12 mm 15 mm

Hard cover (lay flat)

Number of pages Extra spine thickness Total spine thickness
24-28 0 mm 6 mm
30-34 1 mm 7 mm
36-40 2 mm 8 mm
42-46 3 mm 9 mm
48-52 5 mm 11 mm
54-58 6 mm 12 mm
60-64 7 mm 13 mm
66-70 8 mm 14 mm
72-76 9 mm 15 mm
78-82 10 mm 16 mm
84-88 11 mm 17 mm
90-94 13 mm 19 mm
96-100 14 mm 20 mm
102-106 15 mm 21 mm
108-112 16 mm 22 mm
114-118 17 mm 23 mm
120-124 18 mm 24 mm
126-130 19 mm 25 mm
132-136 21 mm 27 mm
138-142 22 mm 28 mm
144-148 23 mm 29 mm
150-154 24 mm 30 mm
156-160 25 mm 31 mm
162-166 26 mm 32 mm
168-172 27 mm 33 mm
174-178 28 mm 34 mm
180-184 30 mm 36 mm
186-190 31 mm 37 mm
192-196 32 mm 38 mm
198-200 33 mm 39 mm