Leaf & Spine

Royal (6.14 x 9.21 in) · 400 pages

400-page 6.14 x 9.21 in book: spine width & cover size

A 400-page 6.14 x 9.21 in paperback has a spine of 0.9008 in (22.88 mm) on white paper or 1 in on cream. Full cover with bleed: 13.431 x 9.46 in.

0.901 inSpine, white paper22.88 mm
1 inSpine, cream paper25.4 mm
13.43 x 9.46Full cover, inchesincl. bleed
567 gEstimated weight20 oz

Cover template (white paper)

Barcode areaBACK COVER6.14 x 9.21 inFRONT COVER6.14 x 9.21 inSPINE 0.901 inFull cover 13.431 x 9.46 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 ink0.9008 in22.88 mm13.431 x 9.46 in341.1 x 240.3 mm4,029 x 2,838 px
Cream paper, black ink1 in25.4 mm13.53 x 9.46 in343.7 x 240.3 mm4,059 x 2,838 px
Standard color (white)0.9008 in22.88 mm13.431 x 9.46 in341.1 x 240.3 mm4,029 x 2,838 px
Premium color (white)0.9388 in23.85 mm13.469 x 9.46 in342.1 x 240.3 mm4,041 x 2,838 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)1.1429 in29.03 mm
400 PPICream book paper (~55 lb)1 in25.4 mm
444 PPIWhite book paper (~50 lb)0.9009 in22.88 mm
500 PPILightweight text (~45 lb)0.8 in20.32 mm
600 PPIThin text (~40 lb)0.6667 in16.93 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 13.431 x 9.46 in — or 4,029 x 2,838 px at 300 ppi.
  • The back cover runs from the left edge to 6.265 in; the spine from 6.265 to 7.166 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)
340 pages0.7657 in0.85 in13.296 x 9.46 in
350 pages0.7882 in0.875 in13.318 x 9.46 in
360 pages0.8107 in0.9 in13.341 x 9.46 in
370 pages0.8332 in0.925 in13.363 x 9.46 in
380 pages0.8558 in0.95 in13.386 x 9.46 in
390 pages0.8783 in0.975 in13.408 x 9.46 in
410 pages0.9233 in1.025 in13.453 x 9.46 in
420 pages0.9458 in1.05 in13.476 x 9.46 in
430 pages0.9684 in1.075 in13.498 x 9.46 in
440 pages0.9909 in1.1 in13.521 x 9.46 in
450 pages1.0134 in1.125 in13.543 x 9.46 in
460 pages1.0359 in1.15 in13.566 x 9.46 in

400 pages in other trim sizes

TrimSpine (white)Full cover (white)
5 x 8 in0.9008 in11.151 x 8.25 in
5.06 x 7.81 in0.9008 in11.271 x 8.06 in
5.25 x 8 in0.9008 in11.651 x 8.25 in
5.5 x 8.5 in0.9008 in12.151 x 8.75 in
6 x 9 in0.9008 in13.151 x 9.25 in
6.69 x 9.61 in0.9008 in14.531 x 9.86 in
7 x 10 in0.9008 in15.151 x 10.25 in
7.5 x 9.25 in0.9008 in16.151 x 9.5 in
8 x 10 in0.9008 in17.151 x 10.25 in
8.5 x 8.5 in0.9008 in18.151 x 8.75 in
8.5 x 11 in0.9008 in18.151 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 400-page 6.14 x 9.21 in book?
On white paper it is 0.9008 in (22.88 mm); on cream paper 1 in (25.4 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 13.431 x 9.46 in (341.1 x 240.3 mm) including 0.125 in bleed on every side. For cream paper: 13.53 x 9.46 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 400-page 6.14 x 9.21 in paperback?
About 567 g (20 oz) on white paper with a standard cover — useful for estimating postage.