A standard adult novel runs about 70,000 to 100,000 words, and a 300-page book holds roughly 72,000 to 87,000 words. At ReadNext, we match books on pace and age fit, and we treat a page count as a rough guide to length.
Word counts change by genre, audience, and printed trim size. Science fiction titles often reach over 100,000 words, middle grade stories stay far shorter, and page counts vary widely based on typography and margins.
How Many Words Are in a Book? Counts by Genre
A standard novel runs 70,000 to 100,000 words according to publishing platform Reedsy, with a floor of 40,000 words and a maximum of about 140,000. Jane Friedman calls 80,000 words the industry standard for a debut novel. She puts the minimum for most novels at 50,000 words and says a novel over 120,000 words faces a challenge.
Chuck Sambuchino writes for Writer’s Digest that 80,000 to 89,999 words is ideal for adult commercial and literary fiction, while 70,000 to 109,999 is safe. Science fiction and fantasy run longest: Writer’s Digest calls 100,000 to 115,000 words excellent and 90,000 to 124,000 acceptable, while young adult targets 55,000 to 79,999. Children’s books sit far below the adult range. Writer’s Digest targets 500 to 600 words for a 32-page picture book, and both Writer’s Digest and Reedsy put middle grade at 20,000 to 55,000 words. Within middle grade, Writer’s Digest notes that upper middle grade targets 40,000 to 55,000 words, while simpler stories run 20,000 to 35,000 words.
Reedsy puts mystery, thriller, romance and literary fiction at 80,000 to 100,000 words each. It gives horror 70,000 to 100,000 words, memoir 80,000 to 90,000 and nonfiction 50,000 to 80,000. Writer’s Digest sets westerns at 50,000 to 80,000 words.
| Genre or Category | Standard Range | Notes and Thresholds |
|---|---|---|
| Adult Commercial & Literary | 80,000 to 89,999 words | Safe range 70,000 to 109,999 (Writer’s Digest); 80,000 debut standard (Jane Friedman) |
| Science Fiction & Fantasy | 100,000 to 115,000 words | Acceptable up to 124,000 words (Writer’s Digest); 100,000 to 115,000 (Reedsy) |
| Mystery & Thriller | 80,000 to 100,000 words | Genre range (Reedsy) |
| Romance | 80,000 to 100,000 words | Genre range (Reedsy) |
| Horror | 70,000 to 100,000 words | Category length target (Reedsy) |
| Western | 50,000 to 80,000 words | Category range (Writer’s Digest) |
| Memoir | 80,000 to 89,999 words | 70,000 to 79,999 acceptable (Writer’s Digest); 80,000 to 90,000 (Reedsy) |
| General Nonfiction | 50,000 to 80,000 words | Standard nonfiction range (Reedsy) |
| Young Adult (YA) | 55,000 to 79,999 words | 55,000 to 79,999 (Writer’s Digest); 55,000 to 80,000 (Reedsy) |
| Middle Grade | 20,000 to 55,000 words | Simpler stories 20,000 to 35,000; upper middle grade 40,000 to 55,000 (Writer’s Digest) |
| Picture Books | 500 to 600 words | Target for standard 32-page picture book format (Writer’s Digest) |
Words per Page and the 300-Page Book
A printed novel page holds about 240 to 290 words. According to book production data from ebookpbook, a 5-inch by 8-inch novel page averages roughly 240 words, with a typical range of 170 to 335 words. A 5.5-inch by 8.5-inch novel page averages about 290 words, ranging from 210 to 400 words. Larger 6-inch by 9-inch trade pages average 345 words, ranging from 250 to 440 words.
Using those per-page numbers, simple arithmetic gives the word count for common book lengths. A 300-page book at 240 to 290 words per page holds roughly 72,000 to 87,000 words. At 275 words per page, the default in our reading time calculator and an estimate rather than a sourced figure, that 300-page book comes to about 82,500 words. A 150-page book at 240 to 290 words per page totals roughly 36,000 to 43,500 words.
Trim size alone moves the page count. As arithmetic, an 82,500-word novel at 240 words a page runs about 344 pages, and at 345 words a page about 239.
Official Length Thresholds for Novels and Stories
The Science Fiction and Fantasy Writers Association (SFWA) sets the Nebula Award rules, which define any story of 40,000 words or more as a novel. Under Nebula rules, a novella runs at least 17,500 but fewer than 40,000 words. A novelette spans from 7,500 to fewer than 17,500 words. A short story contains fewer than 7,500 words.
The annual writing event run by National Novel Writing Month (NaNoWriMo) set a target of 50,000 words written in 30 days every November. Lit Hub reported on April 1, 2025 that the nonprofit was shutting down. A 40,000-word manuscript counts as a novel under the Nebula rules, but Jane Friedman puts the minimum for most novels at 50,000 words, and Writer’s Digest’s safe range for adult fiction starts at 70,000.
Why Printed Pages Differ from Manuscript Pages
A manuscript page is not formatted like a finished printed page. Format resource Tameri Guide for Writers notes that a standard double-spaced manuscript page holds about 250 words, with an actual range from 175 to 300 words. That old rule of thumb came from mechanical typewriters, which produced 10 characters per inch across 25 lines per page.
Format expert William Shunn explains that the 250-word rule of thumb for estimating word count is obsolete because publishers now rely directly on computer word counts. In print, page totals shift because trim size, margins, line spacing, and fonts vary. Two fonts at the same point size can take up different amounts of space, which changes the page count without adding a word.
To compare a manuscript with a printed book, convert both to words. As arithmetic, a 300-page manuscript at Tameri’s 250 words a page is about 75,000 words, close to the 72,000 to 87,000 words of a 300-page printed novel.
Word Counts for Famous Published Books
Famous books show how widely published lengths vary. F. Scott Fitzgerald’s The Great Gatsby runs 47,094 words, according to TeachingBooks. Reedsy lists counts for several more: Suzanne Collins’s The Hunger Games contains 99,750 words, Orson Scott Card’s Ender’s Game has 100,609 words, and Jane Austen’s Sense and Sensibility totals 119,394 words. Tara Westover’s memoir Educated runs 83,424 words, Stephen Chbosky’s The Perks of Being a Wallflower has 60,438 words, and Roald Dahl’s Charlie and the Chocolate Factory totals 30,644 words.
The Harry Potter series grew substantially across its run, according to figures compiled by Word Counter. Harry Potter and the Sorcerer’s Stone runs 76,944 words, while Harry Potter and the Chamber of Secrets has 85,141 words. For Harry Potter and the Prisoner of Azkaban, word count sources differ, with Reedsy listing 106,821 words and Word Counter listing 107,253, putting it at about 107,000 words. Harry Potter and the Goblet of Fire reaches 190,637 words, and Harry Potter and the Order of the Phoenix, the longest, runs 257,045. The last two come in at 168,923 (Harry Potter and the Half-Blood Prince) and 198,227 (Harry Potter and the Deathly Hallows). Across all seven titles, the series contains 1,084,170 words.
Estimating Length and Planning Reading Time
To estimate a book’s length, multiply its page count by 275, the default in our reading time calculator, or count the words on one full page and use that figure instead. If you want to check how long a specific section takes, see our guide on how long does it take to read 100 pages. To read more books this year, try our reading challenge ideas or our guide on how to read faster.
If you want help picking your next book, try our What should I read quiz or explore our foundational guide on How to Read More, and Better.