Leaf & Spine

Royal (6.14 x 9.21 in) · 150 pages

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

A 150-page 6.14 x 9.21 in paperback has a spine of 0.3378 in (8.58 mm) on white paper or 0.375 in on cream. Full cover with bleed: 12.868 x 9.46 in.

0.338 inSpine, white paper8.58 mm
0.375 inSpine, cream paper9.53 mm
12.87 x 9.46Full cover, inchesincl. bleed
224 gEstimated weight7.9 oz

Cover template (white paper)

Barcode areaBACK COVER6.14 x 9.21 inFRONT COVER6.14 x 9.21 inSPINE 0.338 inFull cover 12.868 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 ink0.3378 in8.58 mm12.868 x 9.46 in326.8 x 240.3 mm3,860 x 2,838 px
Cream paper, black ink0.375 in9.53 mm12.905 x 9.46 in327.8 x 240.3 mm3,872 x 2,838 px
Standard color (white)0.3378 in8.58 mm12.868 x 9.46 in326.8 x 240.3 mm3,860 x 2,838 px
Premium color (white)0.3521 in8.94 mm12.882 x 9.46 in327.2 x 240.3 mm3,865 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)0.4286 in10.89 mm
400 PPICream book paper (~55 lb)0.375 in9.53 mm
444 PPIWhite book paper (~50 lb)0.3378 in8.58 mm
500 PPILightweight text (~45 lb)0.3 in7.62 mm
600 PPIThin text (~40 lb)0.25 in6.35 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 12.868 x 9.46 in — or 3,860 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 6.603 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)
90 pages0.2027 in0.225 in12.733 x 9.46 in
100 pages0.2252 in0.25 in12.755 x 9.46 in
110 pages0.2477 in0.275 in12.778 x 9.46 in
120 pages0.2702 in0.3 in12.8 x 9.46 in
130 pages0.2928 in0.325 in12.823 x 9.46 in
140 pages0.3153 in0.35 in12.845 x 9.46 in
160 pages0.3603 in0.4 in12.89 x 9.46 in
170 pages0.3828 in0.425 in12.913 x 9.46 in
180 pages0.4054 in0.45 in12.935 x 9.46 in
190 pages0.4279 in0.475 in12.958 x 9.46 in
200 pages0.4504 in0.5 in12.98 x 9.46 in
210 pages0.4729 in0.525 in13.003 x 9.46 in

150 pages in other trim sizes

TrimSpine (white)Full cover (white)
5 x 8 in0.3378 in10.588 x 8.25 in
5.06 x 7.81 in0.3378 in10.708 x 8.06 in
5.25 x 8 in0.3378 in11.088 x 8.25 in
5.5 x 8.5 in0.3378 in11.588 x 8.75 in
6 x 9 in0.3378 in12.588 x 9.25 in
6.69 x 9.61 in0.3378 in13.968 x 9.86 in
7 x 10 in0.3378 in14.588 x 10.25 in
7.5 x 9.25 in0.3378 in15.588 x 9.5 in
8 x 10 in0.3378 in16.588 x 10.25 in
8.5 x 8.5 in0.3378 in17.588 x 8.75 in
8.5 x 11 in0.3378 in17.588 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 150-page 6.14 x 9.21 in book?
On white paper it is 0.3378 in (8.58 mm); on cream paper 0.375 in (9.53 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 12.868 x 9.46 in (326.8 x 240.3 mm) including 0.125 in bleed on every side. For cream paper: 12.905 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 150-page 6.14 x 9.21 in paperback?
About 224 g (7.9 oz) on white paper with a standard cover — useful for estimating postage.