KDP Cover Size Calculator
Spine width and full paperback cover size with bleed for Amazon KDP, in inches, mm and pixels.
Runs in your browser. Your text and files never leave your device.
- Spine width
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- Full cover width
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- Full cover height
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- Pixels at 300 DPI
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How to size a KDP paperback cover
- Pick your trim size, page count and paper. Use your final interior page count.
- Create a canvas with the full cover width and height (or the pixel size at 300 DPI).
- Place the back cover on the left, the spine in the middle and the front cover on the right, keeping text 0.125" inside the trim lines.
- Export one PDF and upload it to KDP; check the preview for spine alignment.
Numbers from KDP's cover help page (checked 15 November 2026). Want to know what you earn per copy? Use the KDP royalty calculator. Need a barcode for another printer? Make an ISBN barcode.
Frequently Asked Questions
How does KDP calculate spine width?
Page count × paper thickness: 0.002252" per page for white paper, 0.0025" for cream, 0.002347" for premium colour and 0.002252" for standard colour. A 300-page book on white paper has a 0.676" spine.
How big should my full cover file be?
Width = bleed + back cover + spine + front cover + bleed, and height = trim height + top and bottom bleed. KDP's bleed is 0.125" (3.2 mm) on each outside edge.
Can I put text on the spine?
KDP prints spine text only on books with more than 79 pages, and the text needs at least 0.0625" (1.6 mm) of space on each side.
What resolution should the cover be?
At least 300 DPI. The pixel size shown here is the full cover at 300 DPI, ready for Canva, Photoshop or Affinity.
Is this for hardcovers too?
No, these numbers are for KDP paperbacks. Hardcovers use a wrap and hinge with different sizes; use KDP's own cover template for them.