What it makes
How many words in a chapter is a question with no single answer, so this planner gives you arithmetic and a comparison band instead of a rule. Enter a genre and a target word count, choose a pacing, and it returns:
- A chapters-by-words table — five chapter counts around the one your pacing implies, each with the words per chapter it would take to reach your total. Pick the row you like; the arithmetic is already done.
- Reading time per chapter — at 250 words a minute, which the result says out loud. That is the middle of the commonly cited adult silent reading range of roughly 200 to 300 words a minute. A 3,000-word chapter comes back at about twelve minutes, which is the useful number when you are deciding whether a chapter fits a commute or a bedtime.
- A comparison band — the typical published range for your genre in words, chapters and words per chapter, shown as a range rather than a target, so you can see whether your plan sits inside ordinary territory or deliberately outside it.
- Serial mode — enter how many words you write in a session and it divides your target by it, so you know how many nights of writing the whole book is. Multiply by the nights you actually write in a week and you have a finish date. This is the number most writers have never calculated and the one that changes behavior.
The bands it compares against are broad on purpose. Adult novels in the tool run from 60,000 to 120,000 words depending on the category: romance 60,000 to 90,000; thriller, horror, mystery and contemporary 70,000 to 90,000; literary 70,000 to 100,000; science fiction 80,000 to 110,000; fantasy and historical 90,000 to 120,000; and young adult 50,000 to 80,000. Novellas are usually described as 20,000 to 40,000, which is below every band here. Chapters most commonly land between 1,500 and 4,500 words, clustering around 2,000 to 4,000. Published books sit outside all of these ranges constantly; the bands are a sanity check, not a gate.
Everything here is arithmetic and runs in your browser. There is no AI, no account, no cap and nothing to sign up for.
Craft tips
Chapter length is a pacing instrument, not a standard. Short chapters accelerate: the white space between them is a breath, and readers take more of them in an hour. Long chapters immerse and slow the pulse. Choose consciously, and vary deliberately rather than accidentally.
Vary length on purpose at the turns. A very short chapter directly after a long one reads as an impact. Many thrillers put a 400-word chapter immediately after a set piece three times its usual length, and the effect is entirely structural.
End on a change, not at a word count. A chapter that stops because it hit 3,000 words is the most common cause of flat chapter endings. Find the turn, end there, and let the length be what it is; then check the average across ten chapters rather than policing each one.
Consistency matters more than the number. Readers acclimatize to your rhythm within three chapters. A book of 2,500-word chapters with one 9,000-word chapter in the middle is jarring in a way that a book of uniformly long chapters never is.
If chapters run long, look for two goals. Most overlong chapters contain two distinct objectives with a scene break between them. Splitting there usually improves both halves and fixes the pacing without a word of new writing.
If chapters run short, you may be summarizing. Chapters well under the low end of your genre's band frequently turn out to be scenes with the drama compressed out. Check whether the interesting conversation happened off the page.
Use total length as a planning input, not a verdict. Word-count expectations are real, particularly in genre fiction, but they are ranges with wide shoulders, and they matter mainly when you are submitting to someone with a house style. For a private serial they matter not at all.
Count what you actually write for two weeks before you plan. Your real average session output is almost never the number you assume. Two weeks of honest counting makes every projection after it useful instead of aspirational.
A finish date makes the project real. The single most effective thing in this tool is the division in serial mode. Most abandoned novels are not abandoned because the writer could not do it; they are abandoned because the end was never given a date and so stayed permanently theoretical.
For chapter counts by genre and by total word count, read how many chapters in a novel.