Free KDP Cover Calculator
Calculate the exact spine width, full-cover dimensions, bleed, and safe-zone diagram for any Amazon KDP paperback or case-laminate hardcover — instant, in-browser, and verified against KDP’s official cover-template generator. Pass KDP's review on the first try.
Multipliers verified against KDP’s official template generator
- Full cover
- 12.7004 × 9.2500 in
- Other unit
- 322.59 × 234.95 mm
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Pre-filled message you can paste into email, Slack, or a designer brief. Includes a link back to this exact spec.
Embed this calculator on your site
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loading="lazy" title="KDP Cover Calculator"></iframe>
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});</script>Verified math
Every multiplier and bleed value is golden-tested against KDP's official cover-template generator on every commit.
Zero-data architecture
All math runs in your browser. No account, no upload, no cookies set by the calculator itself.
Standards-grade output
Downloadable SVG templates open cleanly in Affinity Publisher, Illustrator, Inkscape, and Figma at the exact KDP-spec geometry.
Before you upload
Will your finished cover pass KDP review?
The calculator gives you the dimensions. Cover Pass-Check reads your finished file and flags wrong size, missing bleed, low DPI, RGB color, and unembedded fonts — before KDP rejects it.
KDP spine multiplier reference
Multiply your interior page count by the multiplier for your format and paper. Every value is verified against KDP’s official cover-template generator.
| Format | Paper | Multiplier (in/page) |
|---|---|---|
| Paperback | White (B&W interior) | 0.002252 |
| Paperback | Cream (B&W interior) | 0.0025 |
| Paperback | Standard Color | 0.002252 |
| Paperback | Premium Color | 0.002347 |
| Hardcover (Case Laminate) | Any | 0.002347 |
Worked KDP cover size examples
Computed by the same formula engine that powers the calculator above. Each row links to a full page for that exact specification.
| Specification | Spine | Full cover (in) |
|---|---|---|
| Novel — 6 × 9 paperback, 300 pages, white | 0.6756″ | 12.9256 × 9.2500 |
| Pocket fiction — 5 × 8 paperback, 250 pages, cream | 0.6250″ | 10.8750 × 8.2500 |
| Workbook — 8.5 × 11 paperback, 120 pages, white | 0.2702″ | 17.5202 × 11.2500 |
| Nonfiction hardcover — 6 × 9, 240 pages | 0.5633″ | 14.3833 × 10.0200 |
Cover dimensions by book type
The right cover size depends on what you’re publishing. Pick the closest match for a pre-filled calculation.
Novels & fiction
Most trade fiction is 5 × 8 or 6 × 9 in on cream or white paper. Spine width scales with page count, so a 280-page novel and a 420-page novel need different covers.
320-page 6 × 9 cream paperbackWorkbooks & journals
Letter-size 8.5 × 11 in is standard for workbooks, planners, and logbooks. The wide trim plus bleed makes the full cover noticeably larger than a novel's.
120-page 8.5 × 11 workbookColor & illustrated books
Premium-color interiors use a thicker 0.002347 in/page multiplier, so an illustrated 7 × 10 in book has a wider spine than a B&W book of the same length.
100-page 7 × 10 premium-color bookCase-laminate hardcover
Hardcover adds a 0.4 in hinge each side of the spine and a 0.51 in wrap on every edge — a different geometry from paperback bleed entirely.
240-page 6 × 9 hardcoverPopular spine-width calculations
Every page count and trim combination has its own pre-computed page with the full cover spec, diagram, and template.
Frequently asked
- How do I calculate my KDP book cover size?
- Multiply your interior page count by KDP's paper multiplier to get the spine width, then add trim size and bleed for the full cover. In the calculator, choose paperback or hardcover, pick your trim size and paper type, and enter the page count — it adds trim, bleed, and (for hardcover) hinge and wrap to produce the exact full-cover width and height.
- What size should a KDP paperback cover be?
- It depends on page count, trim, and paper. For a 300-page 6 × 9 in white-paper paperback the full cover is 12.9256 × 9.25 in with a 0.6756 in spine. Enter your own numbers above for an exact, KDP-verified size.
- Is this the same as Amazon's official KDP cover calculator?
- Yes — it uses the same published KDP formulas, and every value is golden-tested against Amazon's official cover-template generator. The difference: it runs entirely in your browser with no Amazon login, and adds a live safe-zone diagram and a downloadable print-ready template.
- What is the Kindle eBook cover size?
- A Kindle eBook cover is a single image, ideally 1,600 × 2,560 px (a 1.6:1 ratio). That is separate from a print cover — this tool calculates print paperback and hardcover dimensions, which change with page count and trim size.
- What spine width do I get for a 200-page book?
- A 200-page white-paper paperback has a 0.4504 in spine (200 × 0.002252). Cream is 0.5000 in; standard color matches white; case-laminate hardcover is 0.4694 in. Adjust paper or page count above to recompute instantly.
- Why did KDP reject my cover for wrong dimensions?
- The most common causes are computing the spine from the wrong paper multiplier and omitting the 0.125 in bleed on every paperback edge. Match the full-cover size from this calculator exactly, keep text inside the safe zone, and upload a single flattened PDF with fonts embedded.
- What is the KDP white-paper paperback spine width formula?
- The KDP white-paper paperback spine width formula is 0.002252 inches per page. Multiply your interior page count by 0.002252 to get the spine width in inches.
- What is the spine multiplier for cream paperback?
- 0.0025 inches per page. Cream pages are slightly thicker than white, so a 300-page cream paperback has a 0.75″ spine versus 0.6756″ for white.
- Does KDP hardcover use a different multiplier than paperback?
- Yes. Case-laminate hardcover always uses 0.002347 inches per page regardless of paper choice, and adds 0.4″ hinge each side of the spine plus 0.51″ wrap on the outside edges.
- What's the difference between paperback and hardcover bleed?
- Paperback bleed is 0.125″ on every outside edge. Hardcover does not use traditional bleed; instead it has a 0.51″ wrap that folds inside the case.
- What is the minimum page count for spine text on a KDP cover?
- 79 pages. Below 79 pages, the spine is too narrow for KDP's automated review to accept printed text or graphics.
- What is the KDP barcode size and placement?
- The recommended barcode area is 2″ × 1.2″ in the bottom-right of the back cover, with at least 0.25″ clearance from the spine and trim edges and 0.76″ from the bottom. The minimum acceptable size is 1.4″ × 0.8″.
- What page-count range does KDP allow?
- KDP paperback supports 24–828 pages. Case-laminate hardcover supports 75–550 pages. Maximums are also subject to trim-size-specific limits.
- What file format does KDP require for cover upload?
- A single flattened PDF with fonts embedded, at 300 DPI minimum and CMYK color. The PDF should combine back cover, spine, and front cover with no crop marks; keep it 40 MB or less (650 MB is the hard limit).
More on where the multipliers come from and the sources behind every number: methodology & sources.