8.5 x 11 in Letter · 640 pages
640-page 8.5 x 11 in book: spine width & cover size
A 640-page 8.5 x 11 in paperback has a spine of 1.4413 in (36.61 mm) on white paper or 1.6 in on cream. Full cover with bleed: 18.691 x 11.25 in.
1.441 inSpine, white paper36.61 mm
1.6 inSpine, cream paper40.64 mm
18.69 x 11.25Full cover, inchesincl. bleed
1,480 gEstimated weight52.2 oz
Cover template (white paper)
Spine and cover by paper type
| Paper | Spine | Spine (mm) | Full cover (in) | Full cover (mm) | At 300 ppi |
|---|---|---|---|---|---|
| White paper, black ink | 1.4413 in | 36.61 mm | 18.691 x 11.25 in | 474.8 x 285.8 mm | 5,607 x 3,375 px |
| Cream paper, black ink | 1.6 in | 40.64 mm | 18.85 x 11.25 in | 478.8 x 285.8 mm | 5,655 x 3,375 px |
| Standard color (white) | 1.4413 in | 36.61 mm | 18.691 x 11.25 in | 474.8 x 285.8 mm | 5,607 x 3,375 px |
| Premium color (white) | 1.5021 in | 38.15 mm | 18.752 x 11.25 in | 476.3 x 285.8 mm | 5,626 x 3,375 px |
Per-page factors are those published by KDP; IngramSpark and offset printers use their own paper calipers.
Other printers: spine by paper PPI
| Paper PPI | Typical stock | Spine | Spine (mm) |
|---|---|---|---|
| 350 PPI | Bulky / heavy stock (~70 lb text) | 1.8286 in | 46.45 mm |
| 400 PPI | Cream book paper (~55 lb) | 1.6 in | 40.64 mm |
| 444 PPI | White book paper (~50 lb) | 1.4414 in | 36.61 mm |
| 500 PPI | Lightweight text (~45 lb) | 1.28 in | 32.51 mm |
| 600 PPI | Thin text (~40 lb) | 1.0667 in | 27.09 mm |
If your printer quotes pages per inch (PPI), spine = pages ÷ PPI. Ask for the exact PPI of your chosen stock.
Designing this cover
- Build the cover canvas at 18.691 x 11.25 in — or 5,607 x 3,375 px at 300 ppi.
- The back cover runs from the left edge to 8.625 in; the spine from 8.625 to 10.066 in; the front cover after that.
- Spine text is allowed — centre it and keep 0.0625 in clear on each side.
- Keep titles and faces at least 0.25 in inside the trim; KDP places the barcode in a 2 x 1.2 in area at the lower right of the back cover.
- Export as a flattened PDF (PDF/X-1a is safest) with fonts embedded.
Nearby page counts
| Pages | Spine (white) | Spine (cream) | Full cover (white) |
|---|---|---|---|
| 580 pages | 1.3062 in | 1.45 in | 18.556 x 11.25 in |
| 600 pages | 1.3512 in | 1.5 in | 18.601 x 11.25 in |
| 620 pages | 1.3962 in | 1.55 in | 18.646 x 11.25 in |
| 660 pages | 1.4863 in | 1.65 in | 18.736 x 11.25 in |
| 680 pages | 1.5314 in | 1.7 in | 18.781 x 11.25 in |
| 700 pages | 1.5764 in | 1.75 in | 18.826 x 11.25 in |
640 pages in other trim sizes
| Trim | Spine (white) | Full cover (white) |
|---|---|---|
| 5 x 8 in | 1.4413 in | 11.691 x 8.25 in |
| 5.06 x 7.81 in | 1.4413 in | 11.811 x 8.06 in |
| 5.25 x 8 in | 1.4413 in | 12.191 x 8.25 in |
| 5.5 x 8.5 in | 1.4413 in | 12.691 x 8.75 in |
| 6 x 9 in | 1.4413 in | 13.691 x 9.25 in |
| 6.14 x 9.21 in | 1.4413 in | 13.971 x 9.46 in |
| 6.69 x 9.61 in | 1.4413 in | 15.071 x 9.86 in |
| 7 x 10 in | 1.4413 in | 15.691 x 10.25 in |
| 7.5 x 9.25 in | 1.4413 in | 16.691 x 9.5 in |
| 8 x 10 in | 1.4413 in | 17.691 x 10.25 in |
| 8.5 x 8.5 in | 1.4413 in | 18.691 x 8.75 in |
Spine width depends only on page count and paper; the cover width changes with the trim.
Frequently asked questions
How wide is the spine of a 640-page 8.5 x 11 in book?
On white paper it is 1.4413 in (36.61 mm); on cream paper 1.6 in (40.64 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 18.691 x 11.25 in (474.8 x 285.8 mm) including 0.125 in bleed on every side. For cream paper: 18.85 x 11.25 in.
Can I put text on the spine?
Yes. KDP allows spine text only for books with more than 79 pages; keep it at least 0.0625 in (1.6 mm) from each spine edge.
How heavy is a 640-page 8.5 x 11 in paperback?
About 1,480 g (52.2 oz) on white paper with a standard cover — useful for estimating postage.