Leaf & Spine

5.5 x 8.5 in Digest · 330 pages

330-page 5.5 x 8.5 in book: spine width & cover size

A 330-page 5.5 x 8.5 in paperback has a spine of 0.7432 in (18.88 mm) on white paper or 0.825 in on cream. Full cover with bleed: 11.993 x 8.75 in.

0.743 inSpine, white paper18.88 mm
0.825 inSpine, cream paper20.96 mm
11.99 x 8.75Full cover, inchesincl. bleed
389 gEstimated weight13.7 oz

Cover template (white paper)

Barcode areaBACK COVER5.5 x 8.5 inFRONT COVER5.5 x 8.5 inSPINE 0.743 inFull cover 11.993 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 ink0.7432 in18.88 mm11.993 x 8.75 in304.6 x 222.3 mm3,598 x 2,625 px
Cream paper, black ink0.825 in20.96 mm12.075 x 8.75 in306.7 x 222.3 mm3,622 x 2,625 px
Standard color (white)0.7432 in18.88 mm11.993 x 8.75 in304.6 x 222.3 mm3,598 x 2,625 px
Premium color (white)0.7745 in19.67 mm12.025 x 8.75 in305.4 x 222.3 mm3,607 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)0.9429 in23.95 mm
400 PPICream book paper (~55 lb)0.825 in20.96 mm
444 PPIWhite book paper (~50 lb)0.7432 in18.88 mm
500 PPILightweight text (~45 lb)0.66 in16.76 mm
600 PPIThin text (~40 lb)0.55 in13.97 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 11.993 x 8.75 in — or 3,598 x 2,625 px at 300 ppi.
  • The back cover runs from the left edge to 5.625 in; the spine from 5.625 to 6.368 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)
270 pages0.608 in0.675 in11.858 x 8.75 in
280 pages0.6306 in0.7 in11.881 x 8.75 in
290 pages0.6531 in0.725 in11.903 x 8.75 in
300 pages0.6756 in0.75 in11.926 x 8.75 in
310 pages0.6981 in0.775 in11.948 x 8.75 in
320 pages0.7206 in0.8 in11.971 x 8.75 in
340 pages0.7657 in0.85 in12.016 x 8.75 in
350 pages0.7882 in0.875 in12.038 x 8.75 in
360 pages0.8107 in0.9 in12.061 x 8.75 in
370 pages0.8332 in0.925 in12.083 x 8.75 in
380 pages0.8558 in0.95 in12.106 x 8.75 in
390 pages0.8783 in0.975 in12.128 x 8.75 in

330 pages in other trim sizes

TrimSpine (white)Full cover (white)
5 x 8 in0.7432 in10.993 x 8.25 in
5.06 x 7.81 in0.7432 in11.113 x 8.06 in
5.25 x 8 in0.7432 in11.493 x 8.25 in
6 x 9 in0.7432 in12.993 x 9.25 in
6.14 x 9.21 in0.7432 in13.273 x 9.46 in
6.69 x 9.61 in0.7432 in14.373 x 9.86 in
7 x 10 in0.7432 in14.993 x 10.25 in
7.5 x 9.25 in0.7432 in15.993 x 9.5 in
8 x 10 in0.7432 in16.993 x 10.25 in
8.5 x 8.5 in0.7432 in17.993 x 8.75 in
8.5 x 11 in0.7432 in17.993 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 330-page 5.5 x 8.5 in book?
On white paper it is 0.7432 in (18.88 mm); on cream paper 0.825 in (20.96 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 11.993 x 8.75 in (304.6 x 222.3 mm) including 0.125 in bleed on every side. For cream paper: 12.075 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 330-page 5.5 x 8.5 in paperback?
About 389 g (13.7 oz) on white paper with a standard cover — useful for estimating postage.