Book Page Count and KDP Spine Estimator
Turn a word count into an estimated paperback page count, then get the KDP spine width and full cover wrap size. Runs in your browser, nothing is uploaded.
Or paste text to count words
How it works
Pages = words / words per page, plus about half a page per chapter opening, plus front and back matter, rounded up to an even number. Words per page are rough rules of thumb for an 11 pt serif body and differ by font, leading and margins, so check the final page count in your formatted PDF. Spine width uses the per-page paper thickness from the KDP Paperback Submission Guidelines (white 0.002252 in, cream 0.0025 in, premium color 0.002347 in, standard color 0.002252 in). Maximum page counts also depend on trim size, so this tool uses the widest limit per paper. Always confirm with the official KDP cover calculator before you upload.
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Open source on GitHub. MIT license. Not affiliated with Amazon KDP.