Leaf & Spine

5.25 x 8 in · 100 pages

100-page 5.25 x 8 in book: spine width & cover size

A 100-page 5.25 x 8 in paperback has a spine of 0.2252 in (5.72 mm) on white paper or 0.25 in on cream. Full cover with bleed: 10.975 x 8.25 in.

0.225 inSpine, white paper5.72 mm
0.25 inSpine, cream paper6.35 mm
10.98 x 8.25Full cover, inchesincl. bleed
115 gEstimated weight4.1 oz

Cover template (white paper)

Barcode areaBACK COVER5.25 x 8 inFRONT COVER5.25 x 8 inSPINE 0.225 inFull cover 10.975 x 8.25 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 ink0.2252 in5.72 mm10.975 x 8.25 in278.8 x 209.6 mm3,293 x 2,475 px
Cream paper, black ink0.25 in6.35 mm11 x 8.25 in279.4 x 209.6 mm3,300 x 2,475 px
Standard color (white)0.2252 in5.72 mm10.975 x 8.25 in278.8 x 209.6 mm3,293 x 2,475 px
Premium color (white)0.2347 in5.96 mm10.985 x 8.25 in279 x 209.6 mm3,295 x 2,475 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)0.2857 in7.26 mm
400 PPICream book paper (~55 lb)0.25 in6.35 mm
444 PPIWhite book paper (~50 lb)0.2252 in5.72 mm
500 PPILightweight text (~45 lb)0.2 in5.08 mm
600 PPIThin text (~40 lb)0.1667 in4.23 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 10.975 x 8.25 in — or 3,293 x 2,475 px at 300 ppi.
  • The back cover runs from the left edge to 5.375 in; the spine from 5.375 to 5.6 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)
40 pages0.0901 in0.1 in10.84 x 8.25 in
48 pages0.1081 in0.12 in10.858 x 8.25 in
56 pages0.1261 in0.14 in10.876 x 8.25 in
64 pages0.1441 in0.16 in10.894 x 8.25 in
72 pages0.1621 in0.18 in10.912 x 8.25 in
80 pages0.1802 in0.2 in10.93 x 8.25 in
90 pages0.2027 in0.225 in10.953 x 8.25 in
110 pages0.2477 in0.275 in10.998 x 8.25 in
120 pages0.2702 in0.3 in11.02 x 8.25 in
130 pages0.2928 in0.325 in11.043 x 8.25 in
140 pages0.3153 in0.35 in11.065 x 8.25 in
150 pages0.3378 in0.375 in11.088 x 8.25 in
160 pages0.3603 in0.4 in11.11 x 8.25 in

100 pages in other trim sizes

TrimSpine (white)Full cover (white)
5 x 8 in0.2252 in10.475 x 8.25 in
5.06 x 7.81 in0.2252 in10.595 x 8.06 in
5.5 x 8.5 in0.2252 in11.475 x 8.75 in
6 x 9 in0.2252 in12.475 x 9.25 in
6.14 x 9.21 in0.2252 in12.755 x 9.46 in
6.69 x 9.61 in0.2252 in13.855 x 9.86 in
7 x 10 in0.2252 in14.475 x 10.25 in
7.5 x 9.25 in0.2252 in15.475 x 9.5 in
8 x 10 in0.2252 in16.475 x 10.25 in
8.5 x 8.5 in0.2252 in17.475 x 8.75 in
8.5 x 11 in0.2252 in17.475 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 100-page 5.25 x 8 in book?
On white paper it is 0.2252 in (5.72 mm); on cream paper 0.25 in (6.35 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 10.975 x 8.25 in (278.8 x 209.6 mm) including 0.125 in bleed on every side. For cream paper: 11 x 8.25 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 100-page 5.25 x 8 in paperback?
About 115 g (4.1 oz) on white paper with a standard cover — useful for estimating postage.