Leaf & Spine

5.06 x 7.81 in · 72 pages

72-page 5.06 x 7.81 in book: spine width & cover size

A 72-page 5.06 x 7.81 in paperback has a spine of 0.1621 in (4.12 mm) on white paper or 0.18 in on cream. Full cover with bleed: 10.532 x 8.06 in.

0.162 inSpine, white paper4.12 mm
0.18 inSpine, cream paper4.57 mm
10.53 x 8.06Full cover, inchesincl. bleed
82 gEstimated weight2.9 oz

Cover template (white paper)

Barcode areaBACK COVER5.06 x 7.81 inFRONT COVER5.06 x 7.81 inSPINE 0.162 inFull cover 10.532 x 8.06 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 ink0.1621 in4.12 mm10.532 x 8.06 in267.5 x 204.7 mm3,160 x 2,418 px
Cream paper, black ink0.18 in4.57 mm10.55 x 8.06 in268 x 204.7 mm3,165 x 2,418 px
Standard color (white)0.1621 in4.12 mm10.532 x 8.06 in267.5 x 204.7 mm3,160 x 2,418 px
Premium color (white)0.169 in4.29 mm10.539 x 8.06 in267.7 x 204.7 mm3,162 x 2,418 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)0.2057 in5.23 mm
400 PPICream book paper (~55 lb)0.18 in4.57 mm
444 PPIWhite book paper (~50 lb)0.1622 in4.12 mm
500 PPILightweight text (~45 lb)0.144 in3.66 mm
600 PPIThin text (~40 lb)0.12 in3.05 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 10.532 x 8.06 in — or 3,160 x 2,418 px at 300 ppi.
  • The back cover runs from the left edge to 5.185 in; the spine from 5.185 to 5.347 in; the front cover after that.
  • At this page count the spine is too thin for text on KDP.
  • 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)
24 pages0.054 in0.06 in10.424 x 8.06 in
32 pages0.0721 in0.08 in10.442 x 8.06 in
40 pages0.0901 in0.1 in10.46 x 8.06 in
48 pages0.1081 in0.12 in10.478 x 8.06 in
56 pages0.1261 in0.14 in10.496 x 8.06 in
64 pages0.1441 in0.16 in10.514 x 8.06 in
80 pages0.1802 in0.2 in10.55 x 8.06 in
90 pages0.2027 in0.225 in10.573 x 8.06 in
100 pages0.2252 in0.25 in10.595 x 8.06 in
110 pages0.2477 in0.275 in10.618 x 8.06 in
120 pages0.2702 in0.3 in10.64 x 8.06 in
130 pages0.2928 in0.325 in10.663 x 8.06 in

72 pages in other trim sizes

TrimSpine (white)Full cover (white)
5 x 8 in0.1621 in10.412 x 8.25 in
5.25 x 8 in0.1621 in10.912 x 8.25 in
5.5 x 8.5 in0.1621 in11.412 x 8.75 in
6 x 9 in0.1621 in12.412 x 9.25 in
6.14 x 9.21 in0.1621 in12.692 x 9.46 in
6.69 x 9.61 in0.1621 in13.792 x 9.86 in
7 x 10 in0.1621 in14.412 x 10.25 in
7.5 x 9.25 in0.1621 in15.412 x 9.5 in
8 x 10 in0.1621 in16.412 x 10.25 in
8.5 x 8.5 in0.1621 in17.412 x 8.75 in
8.5 x 11 in0.1621 in17.412 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 72-page 5.06 x 7.81 in book?
On white paper it is 0.1621 in (4.12 mm); on cream paper 0.18 in (4.57 mm), using KDP's per-page factors.
What size should the full cover be?
For white paper: 10.532 x 8.06 in (267.5 x 204.7 mm) including 0.125 in bleed on every side. For cream paper: 10.55 x 8.06 in.
Can I put text on the spine?
Not on KDP. KDP allows spine text only for books with more than 79 pages. Keep thin spines plain or use a solid colour that wraps slightly onto the covers.
How heavy is a 72-page 5.06 x 7.81 in paperback?
About 82 g (2.9 oz) on white paper with a standard cover — useful for estimating postage.