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Calculate your exact cover dimensions — spine width, bleed, trim size — using Amazon's official formula. Instant results, no account needed.
24-828 pages allowed
You have the spine width, bleed, and total canvas size. Feed them directly into KDPEasy's cover wizard and get a print-ready front, back, and spine — sized to your spec — in about 2 minutes.
Next step
Front, back, and spine — all calculated from your specs automatically.
Choose between Paperback or Hardcover. This affects the calculation method.
Input your book width and height. Common sizes: 6"×9", 5"×8", 8.5"×11".
Enter total pages in your book. This determines spine width.
Select white or cream paper. Different paper types have different thickness.
Click Calculate to see your complete cover dimensions including spine and bleed.
Results include spine width, total cover width, pixel dimensions at 300 DPI, and bleed.
The single biggest source of cover rejections when an author switches binding types is using the wrong spine-width formula. Here is exactly what differs:
Paperback — white paper
0.002252" per page
300 pages → 0.736" spine
Most common. Used for standard novels, non-fiction, workbooks.
Paperback — cream paper
0.002500" per page
300 pages → 0.810" spine
Cream paper is thicker. The same book is noticeably fatter.
Hardcover — case laminate
0.002347" per page
300 pages → 0.764" spine
Hardcover also adds wrap-around cover flaps to the total dimensions.
Hardcover — image wrap
0.002347" per page
300 pages → 0.764" spine
Same spine formula as case laminate, but the cover surface differs aesthetically.
Low-content, workbook, and calendar publishers: Large-format books (8.5"×11", letter-size calendars, square planners) with high page counts — 120 to 200+ pages — have thicker spines than their word count would suggest. These formats use the same formula above but the large trim size means a wider total cover canvas. Always calculate before sending to print.
No manual calculations or spreadsheet formulas needed. Get instant, accurate dimensions.
Incorrect cover dimensions are a top reason for KDP rejections. Our calculator ensures compliance.
Precise measurements ensure your cover looks professional when printed.
No signup, no credit card, no hidden fees. Use it as many times as you need.
A 75,000-word debut novel in 6"×9" at standard formatting runs roughly 273 pages — giving a spine of 0.675". Just wide enough for a title. Enter your exact word-count-derived page count to confirm before you send files to your cover designer.
An 8.5"×11" activity workbook with 120 pages on white paper has a spine of 0.33". Knowing this in advance lets low-content publishers batch-produce covers for whole series with consistent spine layouts — critical for calendar and planner lines.
Hardcover case-laminate books require extra wrap allowance. A 6"×9" hardcover with 300 pages will have a noticeably wider and taller total cover than its paperback equivalent. This calculator shows both so you can hand the right template to your designer.
Cream paper is 0.002500" per page vs. white paper's 0.002252". For a 400-page book that's a 0.099" difference in spine width — nearly 2.5mm. A cover designed for white paper will show white gaps on a cream-paper copy. Calculate both before you commit.
Square and large-format children's books (8.5"×8.5", 8"×10") with low page counts often have very narrow spines — sometimes too narrow for any text. Knowing this upfront means you plan a full-bleed spine image rather than a spine title that would get cropped or rejected.
When publishing a multi-book series, each volume may have a different page count — and therefore a different spine width. Calculate every volume in advance so your series branding stays consistent across the shelf, with logos and series names positioned at the same height.
Enter your trim size (width × height), page count, and paper type into this KDP cover calculator. It automatically calculates the total cover dimensions including spine width and bleed. For example, a 6"×9" book with 100 pages on white paper will have a spine width of approximately 0.285 inches using the formula (100 × 0.002252) + 0.06.
The KDP cover calculator spine width formula is: Spine Width = (Page Count × Paper Thickness) + Cover Allowance. For white paper, use 0.002252 inches per page. For cream paper, use 0.0025 inches per page. Add 0.06 inches for the cover material. Example: 200 pages on white paper = (200 × 0.002252) + 0.06 = 0.5104 inches.
Amazon KDP requires 0.125 inches (1/8 inch) of bleed on all sides of your book cover. This KDP cover calculator automatically includes bleed in the total dimensions, following official KDP cover template guidelines.
The most popular KDP trim sizes are 6"×9" (standard non-fiction), 5"×8" (novels), 8.5"×11" (workbooks), and 5.5"×8.5" (digests). All of these are supported by this KDP cover size calculator.
Yes! Unlike a KDP size calculator Excel spreadsheet, this online tool is always up-to-date with the latest Amazon specifications, requires no downloads, and works on any device. It uses the official KDP spine width formulas automatically.
Yes! Select "Hardcover" in the book type dropdown. Hardcover calculations use different specifications than paperback books, and this calculator handles both formats.
Your cover should be 300 DPI at the calculated dimensions. Once you have your dimensions from this calculator, you can design your cover or use our full KDP cover creator which handles resolution automatically.
This calculator uses the same formulas as Amazon's official KDP cover calculator (0.002252 inches per page for white paper, 0.0025 for cream). The advantage is you don't need to log into your KDP account—just enter your specs and get instant results.
Hardcover and paperback books use different spine width formulas on KDP. Paperback white paper uses 0.002252 inches per page and cream paper uses 0.002500 inches per page. Hardcover case laminate uses 0.002347 inches per page. Hardcovers also have a larger wrap-around allowance than paperbacks, so the total cover dimensions differ significantly even for the same page count.
Low-content books, workbooks, journals, and calendars follow the same KDP formula — enter your trim size (commonly 8.5"×11" for workbooks and letter-size calendars, or 8.5"×8.5" for square calendars) and your page count. Because these formats often have large page counts with fewer words, they tend to have thick spines. The calculator handles any KDP-supported trim size and any page count up to the 828-page maximum.
Amazon KDP requires a minimum spine width of 0.0625 inches before spine text is permitted. For a spine wide enough to comfortably display a title and author name, most designers recommend at least 0.25 inches (roughly 100 pages on white paper). This calculator shows your spine width so you know in advance whether spine text is feasible.
This calculator is designed for KDP perfect-bound paperbacks and hardcovers. Coil-bound and spiral books have different construction and are not offered through Amazon KDP standard publishing, so they are not covered by this tool.
Multiply each inch measurement by 300 to get pixels at 300 DPI. For example, a 15.25" × 9.25" cover = 4575 × 2775 pixels. This calculator outputs pixel dimensions automatically at 300 DPI so you can set up your design file immediately.
Yes. KDP charges per page, and the per-page rate varies by page size. Larger trim sizes like 8.5"×11" have a higher per-page printing cost than smaller sizes like 5"×8". Page count also directly determines printing cost, so use the word-count-to-page calculator alongside this tool to estimate costs before committing to a format.
Total cover width = (Trim Width × 2) + Spine Width + (Bleed × 2). For a 6"×9" book with a 0.5" spine: Total width = (6 × 2) + 0.5 + (0.125 × 2) = 12.75 inches. Total height = Trim Height + (Bleed × 2) = 9 + 0.25 = 9.25 inches. This calculator computes all of this for you instantly.
AI-powered, print-ready front, back, and spine — sized to your exact spec.