Book Page Count Calculator
Estimate how many printed pages a manuscript will fill from its word count, trim size, font size, line spacing and margins — with chapter openings, part pages, images, even or signature rounding, spine width, print cost and a page count for every common trim size.
How it works
Words per page = 300 × (text area ÷ 36.27 sq in) × (11 ÷ font size)² × (1.2 ÷ line spacing) × text density · Body pages = ⌈words ÷ words per page⌉ · Total = body + chapter allowance + part pages + image pages + front/back matter, rounded up to an even number (or a signature multiple) · Spine = pages × paper thickness
Page count is estimated from word count because the real layout only exists after typesetting. In “work it out” mode the calculator measures the text block — the trim size minus the gutter, outside, top and bottom margins — and scales a calibrated 300 words for a 6 × 9 in page in 11 pt type with standard book spacing. Characters per line fall as the type gets bigger and so do lines per page, so words per page scale with the square of the font size; extra line spacing removes lines only. Dialogue-heavy fiction loses space to short lines, dense non-fiction fills pages more fully. Chapters add pages because each one starts on a new page (its last page is half empty on average and the opening page starts lower), about ¾ of a page per chapter, or 1¼ pages when chapters must open on a right-hand page. Part dividers take two pages each, and full- or half-page images and tables are added on top. Printed books always have an even page count — every sheet carries two pages — and offset printers fold sheets into 16- or 32-page signatures, so the total is rounded up and the difference becomes blank pages. Spine width is the page count times the paper’s thickness per page, using the figures Amazon KDP publishes for white, cream and colour paper, or your printer’s pages-per-inch.
Worked example
An 80,000-word novel set at 6 × 9 in in 11 pt type with standard spacing holds about 300 words a page, so the text fills ⌈80,000 ÷ 300⌉ = 267 pages. With 24 chapters that each start on a new page, add 24 × 0.75 = 18 pages; with 10 pages of front and back matter the book has 267 + 18 + 10 = 295 pages, rounded up to 296 for an even count — 148 sheets. On white paper the spine is 296 × 0.002252 = 0.667 in (16.9 mm). The same manuscript at 5.5 × 8.5 in needs about 251 words a page and comes to about 348 pages.
Sources: Amazon KDP — paperback page count, trim size and spine width · Amazon KDP — cover calculator (spine width by paper type)
Frequently asked questions
Why round up to an even number?
Each sheet of paper in a book holds two pages (one per side), so the total page count is always even. Printers pad the last few pages with blanks if your content ends on an odd page. Offset printers go further and fold sheets into signatures of 16 or 32 pages, so choose that rounding if you are getting an offset quote.
How many words fit on a page?
It depends mostly on trim size, font size and line spacing. A 6×9 paperback in 11 pt type with normal book spacing holds roughly 300 words; a 5.5×8.5 page about 250; an 8.5×11 page 550 or more. Going from 11 pt to 12 pt cuts words per page by about 16%, and large-print 14 pt by nearly 40%.
How much do chapters add to the page count?
Every chapter starts on a fresh page, so on average half of its last page is empty and the opening page begins lower down. That adds about three-quarters of a page per chapter, or about one and a quarter if chapters must open on a right-hand page (half of them then need a blank left page). Thirty chapters can easily add 20–40 pages.
Is this exact?
No — it is an estimate for planning spine width, cover design and print quotes. The true count is fixed only after typesetting, once fonts, margins, images and chapter breaks are placed, and it typically lands within about 10% of the estimate. The range shown under the result reflects that.
How is the spine width worked out?
Spine width is the page count multiplied by the thickness of one page. Amazon KDP uses 0.002252 in per page for white paper, 0.0025 in for cream and 0.002347 in for premium colour; other printers give a pages-per-inch (PPI) figure, which you can enter instead. Hardcovers add the board thickness on top, so check your printer’s cover template.
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This calculator is for educational purposes. Double-check important results before acting on them.