Worked examples
Book Spine Width Calculator examples
Pre-calculated examples for common situations. Each one shows the result, the inputs used, and a link to open the figures in the calculator.
Open the book spine width calculator to run your own numbers, or pick a starting example below.
Quick comparison
Estimates use the example inputs shown on each page. Confirm your own figures before buying.
| Example | Result | Spine width |
|---|---|---|
| 150 pages, 6 x 9 in | 14.25 mm spine | 14.25 mm (0.561 in) |
| 200 pages, 6 x 9 in | 19 mm spine | 19 mm (0.748 in) |
| 250 pages, 6 x 9 in | 23.75 mm spine | 23.75 mm (0.935 in) |
| 300 pages, 6 x 9 in | 28.5 mm spine | 28.5 mm (1.122 in) |
| 400 pages, 6 x 9 in | 38 mm spine | 38 mm (1.496 in) |
| 250 pages, cream paper | 28.75 mm spine | 28.75 mm (1.132 in) |
| 300 pages, 5 x 8 in | 28.5 mm spine | 28.5 mm (1.122 in) |
| 300 pages, A5 | 28.5 mm spine | 28.5 mm (1.122 in) |
| 120 pages, narrow spine | 11.4 mm spine | 11.4 mm (0.449 in) |
| 500 pages, color paper | 65 mm spine | 65 mm (2.559 in) |
Common examples
150 pages, 6 x 9 in A planning estimate for a 150-page paperback at a 6 x 9 in trim. 200 pages, 6 x 9 in A planning estimate for a 200-page paperback at a 6 x 9 in trim. 250 pages, 6 x 9 in A planning estimate for a 250-page paperback at a 6 x 9 in trim. 300 pages, 6 x 9 in A planning estimate for a 300-page paperback at a 6 x 9 in trim. 400 pages, 6 x 9 in A planning estimate for a 400-page paperback at a 6 x 9 in trim. 250 pages, cream paper A paper-stock comparison for a 250-page paperback using 0.115 mm cream paper. 300 pages, 5 x 8 in A trim-size example for a 300-page paperback at 5 x 8 in. 300 pages, A5 An A5 trim example for a 300-page paperback. 120 pages, narrow spine A narrow-spine example for deciding whether spine text is practical. 500 pages, color paper A thick-book example showing how color paper assumptions can widen the spine.
Always confirm final cover dimensions with your printer or POD platform.