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1550 Territorial Road Benton Harbor Michigan 49022 (800) 848-8826
 
 
     
 
 
 
 
 
 
 
 
Figuring the spine width of a perfect-bound book is a relatively easy task. To do this, you will need to know the final page count and the type of paper your book will be printed on. Once you have this information, your spine will need to be calculated to the nearest 32nd of an inch.
 
When figuring the spine, you take the page count and divide by 2 and multiply that number by the caliper of the paper. Below is a chart of the house paper and its caliper.
 
EXAMPLE: 128 pages divided by 2 = 64 x caliper .0039 = .2496 = 1/4"
 
Paper Stock
50# white offset
60# white offset
70# white offset
55# glatfelter
Caliper
.0039
.0046
.0054
.0056
Brightness
92
92
92
74
Opacity
90
92
94
94
PPI
515
435
374
360
 
Fraction
Decimal
Fraction
Decimal
1/32"
0.03125
17/32"
0.53125
1/16"
0.06250
9/16"
0.56250
3/32"
0.09375
19/32"
0.59375
1/8"
0.12500
5/8"
0.62500
5/32"
0.15625
21/32"
0.65625
3/16"
0.18750
11/16"
0.68750
7/32"
0.21875
23/32"
0.71875
1/4"
0.25000
3/4"
0.75000
9/32"
0.28125
25/32"
0.78125
5/16"
0.31250
13/16"
0.81250
11/32"
0.34375
27/32"
0.84375
3/8"
0.37500
7/8"
0.87500
13/32"
0.40625
29/32"
0.90625
14/32"
0.43750
15/16"
0.93750
15/32"
0.46875
31/32"
0.96875
1/2"
0.50000
1"
1.00000