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Free KDP cover calculator with the official spine width formula. Calculate exact cover dimensions using 0.002252 inches per page for white paper or 0.0025 for cream paper. Includes bleed, spine, and template guidelines.
Total number of pages in your book
Enter your book specifications and
click Calculate to see results
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.
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.
This calculator is specifically designed for Amazon KDP requirements. It uses the official KDP spine width formulas and includes the required 0.125" bleed on all sides. Whether you're publishing your first book or your fiftieth, accurate dimensions are critical for acceptance.
Typical specs: 5"×8" or 6"×9" trim, 200-400 pages, cream paper for easy reading
Typical specs: 6"×9" trim, 100-300 pages, white paper for images and diagrams
Typical specs: 8.5"×11" trim, 100-200 pages, white paper for writing space
Typical specs: 8"×10" or 8.5"×8.5" square, 24-48 pages, white paper for color
Typical specs: 5"×8" trim, 80-150 pages, cream paper for elegant look
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.
You've got the dimensions. Now create a professional, print-ready KDP cover with our AI-powered cover creator. Front, back, spine - all done in 2 minutes.