No source states a number. No style authority, no publisher guideline, no dataset, and no professional body. The "most novels have 20 to 40 chapters" figures in circulation are not measurements of anything.
The range in published fiction is far wider than the advice suggests. Diana Gabaldon's Go Tell the Bees That I Am Gone has, as the Chicago Manual of Style's editors note, "five parts and 155 chapters", with a table of contents running to seven pages.
Why There Is No Answer
Chapter count is not an independent variable. It falls out of two decisions you have already made:
Total length, which is defined authoritatively. The SFWA's award rules put a novel at "40,000 words or more", a novella at "at least 17,500 words but fewer than 40,000 words".
Chapter length, which is not defined by anyone. The Chicago Manual of Style's editors attribute the familiar 1,500 to 5,000 word range to bloggers rather than to any dataset, as covered in how long should a chapter be.
Divide one by the other and you have your count. A 90,000 word novel in 3,000 word chapters is 30 chapters; in 1,500 word chapters it is 60. Both are entirely normal, and neither is a target.
The Question Worth Asking Instead
Chapter breaks are where a reader is invited to stop. So the real decision is how often you offer them an exit, and that is a pacing choice rather than an arithmetic one.
More chapters means more frequent breaks, more momentum, and a book that reads faster than its word count. Conventional in thrillers, and the reason a 500-page thriller can feel brisk.
Fewer chapters means longer immersion and a heavier, slower feel. Conventional in literary fiction.
The only guidance the Manual itself offers is about consistency: chapters of "a more or less consistent length". A reader notices a chapter that is four times its neighbours far more readily than they notice whether there are 28 or 43 of them.
Parts and Sections
If your count runs high, parts are the conventional remedy. Gabaldon's 155 chapters sit inside five parts.
New Hart's Rules records the convention for numbering them: "It is customary to use upper-case Roman numerals for part numbers and Arabic numerals for chapter numbers." It also notes parts behave differently from chapters in one respect: new chapters may begin on either a verso or a recto, "unlike new parts", which always open on a right-hand page.
Chicago adds a constraint worth knowing before you introduce parts at all: "One cannot have a book that contains a part 1 but no part 2 or a chapter 1 but no chapter 2." One part is not a structure.
What Deckle Does
Parts, chapters and scenes are separate document types, so a book with five parts and 155 chapters is a hierarchy in the Binder rather than a naming convention you maintain by hand.
Chapter numbering is automatic, so splitting chapter twelve into two does not require renumbering everything after it. Formats available are Arabic, spelled out, Roman, uppercase, or hidden, with the word "Chapter" optional. Details in how to number chapters in a novel.
The Outliner shows every chapter with its word count in one list, which is where the only thing the sources actually recommend, consistent length, becomes visible. Scanning that column tells you more than any target count.
Because splitting and merging chapters is structural rather than a cut-and-paste through a long document, the count is genuinely something you can change late without pain. That is worth knowing, because it means you do not have to decide it up front.
Common Mistakes
- Aiming for a chapter count. It is a consequence of length and pacing, not a target.
- Believing "20 to 40 chapters". No dataset supports it.
- Keeping a chapter long to reduce the count. The count is not a quantity anyone is judging.
- Adding parts for one section. Chicago: you cannot have a part 1 with no part 2.
- Numbering chapters by hand. Splitting one then means renumbering the rest.
- Ignoring consistency. It is the only thing the Manual actually recommends.
FAQ
Q: How many chapters should a novel have? A: No authority states a number. It follows from your total length and your chapter length.
Q: Is 155 chapters too many? A: A bestselling novel has exactly that, arranged in five parts.
Q: Should I use parts? A: Useful when the count runs high or the book has distinct movements. You need at least two.
Q: Do all chapters need to be the same length? A: Roughly. "A more or less consistent length" is the Manual's only guidance.
Q: Can I change the count late? A: Yes, and it is easier than it sounds when chapters are separate documents rather than one long file.