KDP spine width calculator
Type your page count and pick your paper. You get the spine width, the full cover size with bleed, and the pixel size at 300 DPI.
- Spine width
- 0.330 in
- Full cover (with bleed)
- 12.580 x 9.250 in
- At 300 DPI
- 3775 x 2775 px
- Text on the spine
- Allowed
120 x 0.002252 + 0.06 = 0.330 in
How does KDP work out spine width?
Page count times the thickness of one page, plus a small allowance for the cover. White paper is about 0.002252 inches a page and cream about 0.0025.
Why does my page count have to be even?
Every sheet has two sides, so KDP prints in pairs. An odd count gets a blank page added at the end.
When can I put text on the spine?
KDP only allows spine text from 79 pages up. Thinner spines are too narrow to print on reliably.
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