This interactive tool will calculate the exact margins required for your KDP paperback to pass automated review.
Required Margins
Gutter (Inside)
0.5"
Outside / Top / Bottom
0.25" min
How KDP Margins Work
Amazon KDP requires specific margins to ensure your text isn’t cut off during the printing and trimming process. The most critical margin is the gutter (the inside margin where the pages are bound to the spine).
The thicker your book (the higher the page count), the larger the gutter must be, otherwise the text will disappear into the crease of the book.
Want us to calculate it for you?
Our AI engine calculates margins automatically based on your exact word count.
Free, no sign-up, nothing to install. Paste this wherever you want it. It keeps working when Amazon changes its figures, because it reads from this page.
The embed carries a small credit line linking back here. That is the only condition, and it is the whole business model for a free tool.
About the Author
Robert Prime
Robert Prime is a best-selling self-published author, veteran eCommerce strategist, and the founder of publishing.co.uk. With over 25 years of experience in digital business he brings a battle-tested perspective to the publishing industry. After experiencing firsthand the archaic, headache-inducing process of formatting a KDP-compliant book for his own best-seller, Google. Panic. Repeat., Robert built publishing.co.uk to solve the problem for other authors. He is also a co-owner of the LoveReading.co.uk network (the UK’s leading book discovery platforms), founder of the Amazon growth agency MrPrime.com, and a member of the Forbes Business Council.
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