Leaf & Spine

8.5 x 8.5 in Square · 660 pages

660-page 8.5 x 8.5 in book: spine width & cover size

A 660-page 8.5 x 8.5 in paperback has a spine of 1.4863 in (37.75 mm) on white paper or 1.65 in on cream. Full cover with bleed: 18.736 x 8.75 in.

1.486 inSpine, white paper37.75 mm
1.65 inSpine, cream paper41.91 mm
18.74 x 8.75Full cover, inchesincl. bleed
1,179 gEstimated weight41.6 oz

Cover template (white paper)

Barcode areaBACK COVER8.5 x 8.5 inFRONT COVER8.5 x 8.5 inSPINE 1.486 inFull cover 18.736 x 8.75 in incl. 0.125 in bleed
Red: bleed (trimmed off) · dashed: 0.25 in safe zone · shaded: spine. Download a full-size template from the calculator.

Spine and cover by paper type

PaperSpineSpine (mm)Full cover (in)Full cover (mm)At 300 ppi
White paper, black ink1.4863 in37.75 mm18.736 x 8.75 in475.9 x 222.3 mm5,621 x 2,625 px
Cream paper, black ink1.65 in41.91 mm18.9 x 8.75 in480.1 x 222.3 mm5,670 x 2,625 px
Standard color (white)1.4863 in37.75 mm18.736 x 8.75 in475.9 x 222.3 mm5,621 x 2,625 px
Premium color (white)1.549 in39.35 mm18.799 x 8.75 in477.5 x 222.3 mm5,640 x 2,625 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 PPITypical stockSpineSpine (mm)
350 PPIBulky / heavy stock (~70 lb text)1.8857 in47.9 mm
400 PPICream book paper (~55 lb)1.65 in41.91 mm
444 PPIWhite book paper (~50 lb)1.4865 in37.76 mm
500 PPILightweight text (~45 lb)1.32 in33.53 mm
600 PPIThin text (~40 lb)1.1 in27.94 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 18.736 x 8.75 in — or 5,621 x 2,625 px at 300 ppi.
  • The back cover runs from the left edge to 8.625 in; the spine from 8.625 to 10.111 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

PagesSpine (white)Spine (cream)Full cover (white)
600 pages1.3512 in1.5 in18.601 x 8.75 in
620 pages1.3962 in1.55 in18.646 x 8.75 in
640 pages1.4413 in1.6 in18.691 x 8.75 in
680 pages1.5314 in1.7 in18.781 x 8.75 in
700 pages1.5764 in1.75 in18.826 x 8.75 in
720 pages1.6214 in1.8 in18.871 x 8.75 in

660 pages in other trim sizes

TrimSpine (white)Full cover (white)
5 x 8 in1.4863 in11.736 x 8.25 in
5.06 x 7.81 in1.4863 in11.856 x 8.06 in
5.25 x 8 in1.4863 in12.236 x 8.25 in
5.5 x 8.5 in1.4863 in12.736 x 8.75 in
6 x 9 in1.4863 in13.736 x 9.25 in
6.14 x 9.21 in1.4863 in14.016 x 9.46 in
6.69 x 9.61 in1.4863 in15.116 x 9.86 in
7 x 10 in1.4863 in15.736 x 10.25 in
7.5 x 9.25 in1.4863 in16.736 x 9.5 in
8 x 10 in1.4863 in17.736 x 10.25 in
8.5 x 11 in1.4863 in18.736 x 11.25 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 660-page 8.5 x 8.5 in book?
On white paper it is 1.4863 in (37.75 mm); on cream paper 1.65 in (41.91 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 18.736 x 8.75 in (475.9 x 222.3 mm) including 0.125 in bleed on every side. For cream paper: 18.9 x 8.75 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 660-page 8.5 x 8.5 in paperback?
About 1,179 g (41.6 oz) on white paper with a standard cover — useful for estimating postage.