Book trim size
5.31 x 8.5 in — UK C-format (135 x 216 mm)
5.31 x 8.5 in · 134.9 x 215.9 mm. A larger British trade paperback, often used for paperback originals and the first paperback edition of a hardback.
About the 5.31 x 8.5 in format
A larger British trade paperback, often used for paperback originals and the first paperback edition of a hardback.
Typical uses: UK first-edition paperbacks, Nonfiction.
How many pages will my book be at 5.31 x 8.5 in?
| Manuscript | 10 pt | 11 pt | 12 pt |
|---|---|---|---|
| 40,000 words | 138 pp | 168 pp | 192 pp |
| 60,000 words | 206 pp | 246 pp | 282 pp |
| 80,000 words | 270 pp | 334 pp | 384 pp |
| 100,000 words | 344 pp | 414 pp | 476 pp |
| 120,000 words | 408 pp | 494 pp | 586 pp |
Estimates for a typical serif body font with 130% leading, chapter openings and front/back matter. Dialogue-heavy fiction runs longer; dense nonfiction shorter.
Spine width and cover size for 5.31 x 8.5 in
| Page count | Spine (white paper) | Spine (cream paper) | Full cover incl. bleed |
|---|---|---|---|
| 100 pages | 0.2252 in / 5.72 mm | 0.25 in / 6.35 mm | 11.095 x 8.75 in |
| 200 pages | 0.4504 in / 11.44 mm | 0.5 in / 12.7 mm | 11.32 x 8.75 in |
| 300 pages | 0.6756 in / 17.16 mm | 0.75 in / 19.05 mm | 11.546 x 8.75 in |
| 400 pages | 0.9008 in / 22.88 mm | 1 in / 25.4 mm | 11.771 x 8.75 in |
| 500 pages | 1.126 in / 28.6 mm | 1.25 in / 31.75 mm | 11.996 x 8.75 in |
Spine factors: 0.002252 in/page white, 0.0025 in/page cream (KDP published values). Other printers vary — use their template.
Margins by page count
| Pages | Min. inside (KDP) | Recommended inside | Outside | Top / bottom | Text block |
|---|---|---|---|---|---|
| 24–150 pages | 0.375 in | 0.625 in | 0.5 in | 0.625 / 0.625 in | 4.19 x 7.25 in |
| 151–300 pages | 0.5 in | 0.75 in | 0.5 in | 0.625 / 0.625 in | 4.06 x 7.25 in |
| 301–500 pages | 0.625 in | 0.875 in | 0.5 in | 0.625 / 0.625 in | 3.94 x 7.25 in |
| 501–700 pages | 0.75 in | 1 in | 0.5 in | 0.625 / 0.625 in | 3.81 x 7.25 in |
| 701–828 pages | 0.875 in | 1.125 in | 0.5 in | 0.625 / 0.625 in | 3.69 x 7.25 in |
Minimum inside margins are KDP's published values; recommended margins are our comfortable defaults for reading.
Two-page spread
Interior PDF page size
| Setup | Page size (in) | Page size (mm) | Full-page image at 300 ppi |
|---|---|---|---|
| No bleed (text only) | 5.31 x 8.5 | 134.9 x 215.9 | 1,593 x 2,550 px |
| With bleed | 5.435 x 8.75 | 138 x 222.3 | 1,630 x 2,625 px |
With bleed, add 0.125 in to the width (outside edge only) and 0.25 in to the height (top and bottom).
Tip: at 5.31 x 8.5 in, a novel of 80,000 words comes to roughly 334 pages at 11 pt. Try different settings in the word count calculator or build a cover with the spine width calculator.