Book thickness
How thick is a 90-page book?
A 90-page paperback is about 0.203 in (5.1 mm) thick on white paper and 0.225 in on cream — 45 sheets of paper.
0.203 inwhite paper5.1 mm
0.225 incream paper
45sheets (leaves)
Spine width by paper
| Paper | Inches | Millimetres | Centimetres |
|---|---|---|---|
| White paper, black ink | 0.2027 in | 5.15 mm | 0.51 cm |
| Cream paper, black ink | 0.225 in | 5.72 mm | 0.57 cm |
| Standard color (white) | 0.2027 in | 5.15 mm | 0.51 cm |
| Premium color (white) | 0.2112 in | 5.37 mm | 0.54 cm |
Full cover size by trim
| Trim | Full cover incl. bleed (white) | Weight |
|---|---|---|
| 5 x 8 in | 10.453 x 8.25 in | 100 g |
| 5.06 x 7.81 in | 10.573 x 8.06 in | 99 g |
| 5.25 x 8 in | 10.953 x 8.25 in | 105 g |
| 5.5 x 8.5 in | 11.453 x 8.75 in | 117 g |
| 6 x 9 in | 12.453 x 9.25 in | 135 g |
| 6.14 x 9.21 in | 12.733 x 9.46 in | 142 g |
| 6.69 x 9.61 in | 13.833 x 9.86 in | 161 g |
| 7 x 10 in | 14.453 x 10.25 in | 175 g |
| 7.5 x 9.25 in | 15.453 x 9.5 in | 174 g |
| 8 x 10 in | 16.453 x 10.25 in | 200 g |
| 8.5 x 8.5 in | 17.453 x 8.75 in | 181 g |
| 8.5 x 11 in | 17.453 x 11.25 in | 234 g |
Offset papers by PPI
| PPI | Typical stock | Spine | Spine (mm) |
|---|---|---|---|
| 350 PPI | Bulky / heavy stock (~70 lb text) | 0.257 in | 6.5 mm |
| 400 PPI | Cream book paper (~55 lb) | 0.225 in | 5.7 mm |
| 444 PPI | White book paper (~50 lb) | 0.203 in | 5.1 mm |
| 500 PPI | Lightweight text (~45 lb) | 0.18 in | 4.6 mm |
| 600 PPI | Thin text (~40 lb) | 0.15 in | 3.8 mm |
Other page counts
Frequently asked questions
How thick is a 90-page book?
A 90-page paperback is about 0.203 in (5.1 mm) thick on white paper and 0.225 in on cream — 45 sheets of paper.
How many sheets of paper are in a 90-page book?
45 leaves — each sheet carries two pages, one on each side.
Can a 90-page book have text on the spine?
Yes.