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Free KDP cover calculator

KDP cover calculator for exact spine and full wrap size.

Choose trim size, page count, and paper. Get the full-wrap dimensions before you place a single cover element.

Current paperback formulasInches, millimeters, and pixelsDownloadable SVG guide
Spine width0.450 in11.44 mm
Full cover size12.700 × 9.250 in322.59 × 234.95 mm
Canvas at 300 DPI3810 × 2775 px300 DPI
Spine text

Eligible: more than 79 pages. Keep at least 0.0625 in from each spine edge.

Paperback calculation uses KDP's published 0.125 in bleed and current paper thickness factors. Always confirm the final page count after interior formatting.

Why the final page count controls your cover

The spine is calculated from the page count after the interior is formatted. A cover built from a draft page count can shift the front and back panels even when the artwork itself looks polished.

Every paperback cover also needs 0.125 inches of bleed on the top, bottom, and outside edges. The calculator includes that bleed in the full file size.

  • Recalculate after every interior pagination change
  • Do not place spine text below 80 pages
  • Keep important text away from trim and fold lines

Use the guide without creating a rejection

Download the SVG as a design guide, place it in your design file, and keep it on a non-printing layer. Export one continuous PDF containing back cover, spine, and front cover.

This calculator covers paperback geometry. Hardcover case wrap and dust jacket measurements use different rules.

Next release checks

Free DOCX preflight

KDP book formatter preflight for your Word manuscript.

Open the DOCX you intend to publish. Find hidden comments, tracked changes, missing heading structure, and suspiciously short content without uploading the manuscript.Open check

Free KDP error decoder

Turn a KDP failed manuscript upload into the next fix.

Paste the complete platform message. The browser maps common phrases to the file, page, dimension, or metadata check to make next.Open check

Book formatting service pricing

Pay for a publishable release, not a bucket of AI credits.

Start with useful checks for free. Pay once for one title or choose annual capacity when you publish repeatedly.Open check

FAQ

Frequently asked questions

How is KDP paperback spine width calculated?

Multiply the final page count by the paper factor: 0.002252 inches for white paper, 0.0025 for cream paper, 0.002347 for premium color, or 0.002252 for standard color.

How much bleed does a KDP cover need?

KDP requires 0.125 inches on the top, bottom, and each outside edge. The spine-facing edges do not receive an extra outside bleed.

Can I put text on a 79-page spine?

No. KDP prints spine text only when a book has more than 79 pages, so the practical minimum is 80 pages.

Dimensions are only the first cover check.

Lock the final manuscript version, cover, metadata, and store copy into one release package.

Start a $39 book release