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How many words fit on a book page? I measured it
Set by Kernsetzer, a 6 × 9 in page at 11 pt holds about 400 words of fiction. Most page-count calculators assume 250 or 300. So an 80,000-word novel in 25 chapters comes to about 244 pages in 6 × 9 in, not the 320 that 250 words a page gives. This post is about where those numbers come from and how far they go.
Words per page by trim and text size
These are the words of English fiction, dialogue included, that Kernsetzer fits on one page with its Classic theme:
| Trim | 10 pt | 11 pt | 12 pt |
|---|---|---|---|
| 5 × 8 in | 386 | 320 | 273 |
| 5.25 × 8 in | 396 | 330 | 289 |
| 5.5 × 8.5 in | 430 | 367 | 310 |
| 6 × 9 in | 485 | 401 | 354 |
Non-fiction with long paragraphs fits 4 to 9 % more: 435 words on a 6 × 9 in page at 11 pt. The European sizes were measured too. At 11 pt, a 12 × 19 cm page holds 286 words of English fiction and a 15.5 × 22 cm page 401.
Why 250 or 300 words a page is off
A rule of thumb treats the page as a fixed amount of text. It isn’t. The words on a page follow the length of a line and the number of lines, and both change with the trim, the text size, the margins and the font. Going from 6 × 9 down to 5 × 8 in at 11 pt takes a fifth of the words off every page, from 401 to 320. Going up from 11 to 12 pt takes off another eighth.
In my measurements, 250 words a page comes close only at the small end: 5 × 8 in at 12 pt holds 273. Three hundred fits 5 × 8 in at 11 pt or 5.25 × 8 in at 12 pt, roughly. For a bigger page, either number makes the book much longer than it will be.
A fixed number also leaves out the chapters. Each chapter starts on a new page, a little way down, and its last page is rarely full. In the measurements that came to about one and a half pages per chapter. In the 80,000-word novel above, the 25 chapters account for about 37 of its 244 pages. The same words in 15 chapters make 230 pages, in 40 chapters 266.
How I measured it
I wanted the numbers from the same typesetting that sets the finished book. Kernsetzer sets its pages with Typst, which runs inside the app, and the same typesetting runs from the command line as kernsetzer render. On 28 October 2026 I had it set sample texts at every trim the calculator offers: 5 × 8, 5.25 × 8, 5.5 × 8.5 and 6 × 9 in from KDP’s list, and 12 × 19, 13.5 × 21.5, A5 and 15.5 × 22 cm from BoD’s. Each one at 10, 11 and 12 pt, with the Classic theme, its margins and its font, Libertinus Serif.
There were two texts per language, in English and in German. One has all the paragraphs of a novel, short lines of dialogue included. The other has only the long paragraphs, which on the page looks like non-fiction. They come from the test manuscripts in Kernsetzer’s repository, written for the app’s tests, so they aren’t from anyone’s published book. The words per page are what those runs gave, and so is the page and a half per chapter.
I didn’t set 10.5 and 11.5 pt. For those the calculator takes the value halfway between the sizes on either side. The whole table, both languages and both kinds of text, is in the calculator’s script, page-count.js, and a small test checks its arithmetic, the 244 pages above included.
What moves the number
The trim. A 6 × 9 in page holds a quarter more than a 5 × 8 in page at the same size. The 80,000-word novel is about 294 pages in 5 × 8 in and 244 in 6 × 9 in. Both counts include six pages for the title, the copyright page and the contents.
The text size. At 10 pt a page holds about a fifth more than at 11 pt, at 12 pt about an eighth less. In 6 × 9 in the same novel runs from 210 pages at 10 pt to 270 at 12 pt.
The chapters. About one and a half pages each, as above, whatever their length. Many short chapters add more pages than a few long ones.
The kind of text. Short lines of dialogue end early and leave the rest of the line empty, so fiction fits fewer words on a page than non-fiction. Set as non-fiction, the novel would be 228 pages in 6 × 9 in instead of 244.
The language. German words are longer. In the German sample a word took 6.12 characters with its space, in the English one 5.26. So a German page holds about 15 % fewer words: 351 on a 6 × 9 in page at 11 pt, against 401 in English. For German, characters are the better measure, which is why the German calculator also takes Normseiten, the standard manuscript page of 1,800 characters.
How far to trust it
Take any of these numbers as within about 10 % either way; that is the range the calculator shows. They hold for the Classic theme. A wider font such as Georgia, bigger margins or looser line spacing push the page count up, a narrower font pushes it down, and another font with other margins can move it by 10 to 20 %. Pictures, tables, poems and part title pages aren’t in it at all.
It also rests on two sample texts per language. A novel with more dialogue than the sample will come out a little longer, one with less a little shorter. Once a book is typeset, its real page count replaces all of this, and that is the number to give KDP and the cover designer.
The calculator and the guide
The page count calculator does this arithmetic for your own word count, trim, text size and chapters, and works out KDP’s spine width from the result. The guide to trim sizes goes through KDP’s and BoD’s lists and what each size does to the page count. In Kernsetzer itself, the page count isn’t an estimate: change the trim or the text size, and the whole book is set again. The public beta starts in mid-November; you can sign up here.