Are you an aspiring author, curious reader, or just wondering how long a 100-page book really is? Understanding book lengths can be confusing, as they can vary greatly depending on the genre, font size, and other factors.

If you’re short on time, here’s a quick answer to your question: Typically, a 100-page book has around 20,000 to 30,000 words.

In this article, we’ll take a closer look at book lengths, how they’re calculated, and what factors can affect the final word count. We’ll also explore how book lengths differ across genres and provide some tips for authors looking to hit a specific length for their manuscript.

How are Book Lengths Calculated?

As a writer or a reader, you may have wondered how book lengths are calculated. While there are no hard and fast rules, book lengths are typically calculated based on either word count or page count. Both methods have their own advantages and limitations, and the choice of method depends on various factors.

Word Count vs. Page Count

The word count method is the more precise of the two methods, as it measures the actual number of words in a book. This method is especially useful for books that have a lot of dialogue, as dialogue tends to take up less space on a page than narrative. On the other hand, the page count method is more commonly used, as it is easier to determine and is more familiar to readers. The page count method also takes into account factors such as font size, line spacing, margins, and the overall design of the book.

Factors that Affect Book Length

Several factors can affect the length of a book, regardless of the method used to calculate it. The genre of the book is one of the most significant factors, as different genres have different expectations for length. For example, a romance novel typically has fewer words or pages than a science fiction novel. The intended audience also plays a role, as children’s books tend to be shorter than books for adults. The author’s writing style, the complexity of the plot, and the amount of research required are other factors that can affect book length.

Calculating Book Length: Examples and Formulas

To calculate book length using the word count method, simply count the number of words in the manuscript. The average length of a novel is around 80,000 to 100,000 words, while a novella typically ranges from 20,000 to 40,000 words. Non-fiction books can vary widely in length, depending on the subject matter and intended audience.

To calculate book length using the page count method, there are several formulas that can be used. One common formula is to assume an average of 250 words per page, which would result in a 100-page book having around 25,000 words. However, this formula is not always accurate, as different fonts, spacing, and design choices can significantly affect the page count. Another formula is to divide the total word count by the number of words per page, which can give a more accurate estimate of the page count.

Regardless of the method used to calculate book length, it is important to keep in mind that book length is only one factor that contributes to the overall quality and success of a book. While some readers may prefer shorter books, others may enjoy longer books that allow for more character development and plot complexity. Ultimately, the most important factor is whether the book engages and entertains its intended audience.

Book Lengths Across Genres

When it comes to writing a book, one of the most important things to consider is its length. Book length can vary greatly depending on the genre, intended audience, and even the author’s personal preference. Here are some general guidelines for book lengths across different genres:

  • Fiction vs. Non-Fiction: Fiction books tend to be longer than non-fiction books. According to The Guardian, the average length of a debut novel is around 80,000 words, while non-fiction books generally range from 50,000 to 75,000 words.
  • Children’s Books: Children’s books tend to be shorter than adult books. Picture books for young children are typically around 500 to 1,000 words, while chapter books for older children may be around 10,000 to 15,000 words.
  • Young Adult Novels: Young adult novels can vary in length, but they generally range from 50,000 to 80,000 words. According to Publishers Weekly, the average length of a young adult novel in 2016 was 75,000 words.
  • Memoirs and Biographies: Memoirs and biographies can vary greatly in length depending on the subject matter and the author’s writing style. However, they generally range from 70,000 to 100,000 words.
  • Poetry and Short Stories: Poetry and short story collections are typically shorter than other types of books. A poetry collection may have anywhere from 20 to 100 poems, while a short story collection may have around 10 to 20 stories.

Remember, these are just general guidelines and there are always exceptions. Some authors may choose to write longer or shorter books depending on their personal style and the story they want to tell. Ultimately, the most important thing is to tell a compelling story that engages your readers, regardless of the book’s length.

Tips for Authors: Hitting Your Target Length

When writing a book, one of the most important considerations is its length. Knowing how many words are in a 100 page book, for example, can help you set realistic goals and ensure that your manuscript is the appropriate length for your genre and target audience. Here are some tips for hitting your target length:

  • Setting Realistic Goals: Before you start writing, take some time to research the typical word counts for books in your genre. This will give you a sense of how long your book should be and help you set a realistic goal for your manuscript. Keep in mind that different genres have different expectations for length, so be sure to do your research.
  • Writing Efficiently: One of the best ways to hit your target length is to write efficiently. This means staying focused, setting aside dedicated writing time, and avoiding distractions. Try setting a daily word count goal for yourself and sticking to it. You might be surprised how quickly your manuscript grows when you stay focused and write consistently.
  • Editing and Revising: Once you’ve written your manuscript, it’s time to start editing and revising. This is where you can really fine-tune your book’s length and ensure that it’s hitting your target. Look for opportunities to trim unnecessary words or sentences, tighten up your prose, and eliminate any sections that aren’t moving the story forward. A good editor can be invaluable in helping you achieve your target length.

Remember, hitting your target length is just one part of the book writing process. But by setting realistic goals, writing efficiently, and editing and revising carefully, you can ensure that your book is the appropriate length for your genre and audience. Happy writing!


Book lengths can be a crucial factor in the success of a manuscript, and understanding how they’re calculated is essential for authors, publishers, and readers alike. While there’s no one-size-fits-all answer to the question of how many words are in a 100-page book, it’s safe to say that most fall within the range of 20,000 to 30,000 words.

Whether you’re writing a novel, memoir, or children’s book, it’s important to consider your target length from the outset and to work efficiently to achieve it. With the tips and tools outlined in this article, you’ll be well on your way to producing a book that’s both engaging and appropriately sized for its genre and audience.

Similar Posts