Leaf & Spine

8.5 x 8.5 in Square · 90 pages

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

A 90-page 8.5 x 8.5 in paperback has a spine of 0.2027 in (5.15 mm) on white paper or 0.225 in on cream. Full cover with bleed: 17.453 x 8.75 in.

0.203 inSpine, white paper5.15 mm
0.225 inSpine, cream paper5.72 mm
17.45 x 8.75Full cover, inchesincl. bleed
181 gEstimated weight6.4 oz

Cover template (white paper)

Barcode areaBACK COVER8.5 x 8.5 inFRONT COVER8.5 x 8.5 inSPINE 0.203 inFull cover 17.453 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 ink0.2027 in5.15 mm17.453 x 8.75 in443.3 x 222.3 mm5,236 x 2,625 px
Cream paper, black ink0.225 in5.72 mm17.475 x 8.75 in443.9 x 222.3 mm5,242 x 2,625 px
Standard color (white)0.2027 in5.15 mm17.453 x 8.75 in443.3 x 222.3 mm5,236 x 2,625 px
Premium color (white)0.2112 in5.37 mm17.461 x 8.75 in443.5 x 222.3 mm5,238 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)0.2571 in6.53 mm
400 PPICream book paper (~55 lb)0.225 in5.72 mm
444 PPIWhite book paper (~50 lb)0.2027 in5.15 mm
500 PPILightweight text (~45 lb)0.18 in4.57 mm
600 PPIThin text (~40 lb)0.15 in3.81 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 17.453 x 8.75 in — or 5,236 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 8.828 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)
32 pages0.0721 in0.08 in17.322 x 8.75 in
40 pages0.0901 in0.1 in17.34 x 8.75 in
48 pages0.1081 in0.12 in17.358 x 8.75 in
56 pages0.1261 in0.14 in17.376 x 8.75 in
64 pages0.1441 in0.16 in17.394 x 8.75 in
72 pages0.1621 in0.18 in17.412 x 8.75 in
80 pages0.1802 in0.2 in17.43 x 8.75 in
100 pages0.2252 in0.25 in17.475 x 8.75 in
110 pages0.2477 in0.275 in17.498 x 8.75 in
120 pages0.2702 in0.3 in17.52 x 8.75 in
130 pages0.2928 in0.325 in17.543 x 8.75 in
140 pages0.3153 in0.35 in17.565 x 8.75 in
150 pages0.3378 in0.375 in17.588 x 8.75 in

90 pages in other trim sizes

TrimSpine (white)Full cover (white)
5 x 8 in0.2027 in10.453 x 8.25 in
5.06 x 7.81 in0.2027 in10.573 x 8.06 in
5.25 x 8 in0.2027 in10.953 x 8.25 in
5.5 x 8.5 in0.2027 in11.453 x 8.75 in
6 x 9 in0.2027 in12.453 x 9.25 in
6.14 x 9.21 in0.2027 in12.733 x 9.46 in
6.69 x 9.61 in0.2027 in13.833 x 9.86 in
7 x 10 in0.2027 in14.453 x 10.25 in
7.5 x 9.25 in0.2027 in15.453 x 9.5 in
8 x 10 in0.2027 in16.453 x 10.25 in
8.5 x 11 in0.2027 in17.453 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 90-page 8.5 x 8.5 in book?
On white paper it is 0.2027 in (5.15 mm); on cream paper 0.225 in (5.72 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 17.453 x 8.75 in (443.3 x 222.3 mm) including 0.125 in bleed on every side. For cream paper: 17.475 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 90-page 8.5 x 8.5 in paperback?
About 181 g (6.4 oz) on white paper with a standard cover — useful for estimating postage.