KDP Cover Size Calculator
Trim size, page count and paper type in — exact full-wrap cover dimensions out, with a panel-by-panel breakdown.
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Full-wrap cover size
12.9256 × 9.25 in
328.31 × 234.95 mm 3,878 × 2,775 px @ 300 DPI
| Panel | Width (in) | Width (mm) | Width (px) |
|---|---|---|---|
| Back cover | 6.125 | 155.57 | 1,838 |
| Spine | 0.6756 | 17.16 | 203 |
| Front cover | 6.125 | 155.57 | 1,838 |
Back and front panel widths include 0.125 in of bleed on their outer edge. All panels share the full wrap height of 9.25 in.
How the wrap is assembled
A KDP cover file is one flat sheet holding three panels — back, spine, front, in that order — plus bleed on the outside edges:
width = 2 × trim width + spine + 0.25
height = trim height + 0.25
Worked example — 6 × 9 in, 300 pages, white paper: spine is 300 × 0.002252 = 0.6756 in, so the wrap is 2 × 6 + 0.6756 + 0.25 = 12.9256 in wide and 9 + 0.25 = 9.25 in tall. Only the width changes with page count — height just adds bleed above and below.
The spine edges are folds, not cuts, so there is no bleed between panels — each cover panel carries bleed only on its outer edge. Here is the same example drawn to scale:
Questions
Frequently asked questions
Why is the file wider than two covers?
The wrap holds back cover + spine + front cover on one sheet, plus 0.125 in of bleed on the left and right edges: 2 × trim width + spine + 0.25 in. The spine grows with page count, so a 150-page and a 500-page book at the same trim size need different file widths.
Do I need to add bleed myself?
No — the dimensions this calculator gives you already include KDP's required 0.125 in bleed on every outside edge. Your job is to make sure background art extends all the way to those edges, with nothing important in the outer 0.125 in.
How do inches convert to pixels?
Multiply by the DPI. KDP recommends 300 DPI, so a 12.9256 × 9.25 in wrap becomes 3,878 × 2,775 px. If you build the cover as an image, create the canvas at exactly those pixel dimensions.
Where do these trim sizes come from?
They are KDP's standard paperback trim sizes. 6 × 9 in is by far the most common choice for novels and general nonfiction; each size also has its own template page with full dimension tables.