Book thickness
How thick is a 40-page book?
A 40-page paperback is about 0.09 in (2.3 mm) thick on white paper and 0.1 in on cream — 20 sheets of paper.
0.09 inwhite paper2.3 mm
0.1 incream paper
20sheets (leaves)
Spine width by paper
| Paper | Inches | Millimetres | Centimetres |
|---|---|---|---|
| White paper, black ink | 0.0901 in | 2.29 mm | 0.23 cm |
| Cream paper, black ink | 0.1 in | 2.54 mm | 0.25 cm |
| Standard color (white) | 0.0901 in | 2.29 mm | 0.23 cm |
| Premium color (white) | 0.0939 in | 2.38 mm | 0.24 cm |
Full cover size by trim
| Trim | Full cover incl. bleed (white) | Weight |
|---|---|---|
| 5 x 8 in | 10.34 x 8.25 in | 52 g |
| 5.06 x 7.81 in | 10.46 x 8.06 in | 51 g |
| 5.25 x 8 in | 10.84 x 8.25 in | 54 g |
| 5.5 x 8.5 in | 11.34 x 8.75 in | 60 g |
| 6 x 9 in | 12.34 x 9.25 in | 70 g |
| 6.14 x 9.21 in | 12.62 x 9.46 in | 73 g |
| 6.69 x 9.61 in | 13.72 x 9.86 in | 83 g |
| 7 x 10 in | 14.34 x 10.25 in | 90 g |
| 7.5 x 9.25 in | 15.34 x 9.5 in | 90 g |
| 8 x 10 in | 16.34 x 10.25 in | 103 g |
| 8.5 x 8.5 in | 17.34 x 8.75 in | 93 g |
| 8.5 x 11 in | 17.34 x 11.25 in | 121 g |
Offset papers by PPI
| PPI | Typical stock | Spine | Spine (mm) |
|---|---|---|---|
| 350 PPI | Bulky / heavy stock (~70 lb text) | 0.114 in | 2.9 mm |
| 400 PPI | Cream book paper (~55 lb) | 0.1 in | 2.5 mm |
| 444 PPI | White book paper (~50 lb) | 0.09 in | 2.3 mm |
| 500 PPI | Lightweight text (~45 lb) | 0.08 in | 2 mm |
| 600 PPI | Thin text (~40 lb) | 0.067 in | 1.7 mm |
Other page counts
Frequently asked questions
How thick is a 40-page book?
A 40-page paperback is about 0.09 in (2.3 mm) thick on white paper and 0.1 in on cream — 20 sheets of paper.
How many sheets of paper are in a 40-page book?
20 leaves — each sheet carries two pages, one on each side.
Can a 40-page book have text on the spine?
Not on KDP, which requires more than 79 pages for spine text.