It’s Up to You – Within Reason

Before you decide your average chapter length, it's a good idea to think about the purpose behind dividing a book into chapters. Think of it as a TV series or a play. Each chapter will consist of one or more scenes that contribute to the development of the story.

Unlike TV series, you aren't limited to a certain amount of airtime, so some important scenes may require longer chapters. The important thing is to end each chapter at the end of a scene, allowing your reader to save the next "episode" for another time.

However, it doesn't make much sense to have one chapter that takes up a major part of the book while other chapters are much shorter. Admittedly, some published authors have done just that, but your readers may find it a little odd.

Your audience may also play a role. For example, books for the youth market often have shorter chapters than those intended for adult readers. Again, it isn't a rule, but if you're writing for people with a short attention span, shorter chapters make sense.