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Get your cover size right the first time
Exact spine width
Page count × KDP’s paper thickness: 0.002252″ white, 0.0025″ cream, 0.00235″ groundwood, 0.002347″ premium color.
Full cover size with bleed
Back + spine + front plus 0.125″ bleed on every outside edge — in inches, millimeters and pixels at 300 DPI.
Spine text check
KDP prints spine text only on books with 80 pages or more; see how much room the 0.0625″ margins leave.
All 16 KDP trim sizes
From 5×8 to 8.5×11 and A4, with KDP’s page-count range for each trim size and paper.
Cover template download
A template with bleed, trim, spine folds and safe zones — SVG for Canva, Affinity or Illustrator, or PNG at 300 DPI.
Official KDP rules
Thickness per page, bleed and spine rules come straight from KDP’s help pages.
How to size a KDP paperback cover
- 1Choose your interior and paper: black ink on white, cream or groundwood, or color.
- 2Pick the trim size and enter the final page count of your interior.
- 3Read the spine width and the full cover size with bleed.
- 4Download the cover template and design inside the safe zones.
KDP spine & cover FAQ
How do I calculate the spine width for KDP?
Multiply the page count by the paper thickness: 0.002252″ per page for white paper, 0.0025″ for cream, 0.00235″ for groundwood, 0.002252″ for standard color and 0.002347″ for premium color. A 300-page book on cream paper has a 0.75″ spine.
What is the full cover size for a KDP paperback?
Width = 0.125″ bleed + back cover + spine + front cover + 0.125″ bleed; height = trim height + 0.25″. A 6×9 book with a 0.75″ spine needs a 13 × 9.25″ cover.
How many pages do I need for spine text?
KDP prints spine text only on books with more than 79 pages. Keep at least 0.0625″ between the text and each spine edge — the fold can move by that much.
What resolution should the cover be?
At least 300 DPI, uploaded as one PDF with back cover, spine and front cover. The calculator shows the pixel size at 300 DPI.
Where does the barcode go?
KDP places it in the lower right of the back cover (lower left for right-to-left books) if you do not add your own — keep that corner free of text.
Does the page count include blank pages?
Yes — use the final page count of your interior PDF, including blank and front-matter pages. KDP counts every page (each side of a sheet).
More free tools
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Your real KDP profit: royalties minus ads, software and one-time costs — with break-even and the ACoS your ads can afford.
Free KDP Cover Size Calculator
Cover dimensions for every KDP format — paperback with bleed, hardcover with wrap and hinge, and Kindle eBook.
Build the whole book — inside and cover
Wisdom Effect builds whole Sudoku, Wordoku, Word Search, Maze, Word Scramble and Missing Vowels books: interiors with KDP-safe margins, gutters and answer keys, and a cover sized to the page count — free trial with 25 credits, no credit card.