Book word count by genre: How long should your manuscript be?

Whether you are putting the final touches on a draft or outlining your next project, one question almost always pops up: 'How long is my book supposed to be?'

It is easy to view word count as just an arbitrary target, but in the publishing world, length matters. Readers buy books with specific expectations based on genre, and Amazon’s algorithms track reader completion rates closely.

Crucially, your word count isn't just a writing milestone—it directly dictates your editing strategy and your self-publishing budget.

Here is a breakdown of target word counts by book genre, why those standards exist, and how to fix a manuscript that is running too long or falling short.

Standard word count benchmarks by book genre

While there are always exceptions, sticking close to these industry standard ranges ensures your book fits reader expectations and stays commercially competitive.

1. Fiction

Genre	Target Word Count	Typical Pacing & Structure
Flash Fiction	100–500	Ultra-concise, single scene or emotion.
Short Story	1,000–8,000	Focused narrative, minimal subplots.
Novella	20,000–50,000	Compact arc, ideal for serials or lead magnets.
Romance	40,000–100,000	40k–70k for category/sub-genres; 70k–100k for mainstream.
Mysteries / Thrillers / Suspense	70,000–90,000	High-tension pacing (cozy mysteries sit at 70–75k).
Literary / Commercial Fiction	80,000–110,000	Strong character focus, rich prose; 100k is ideal.
Crime Fiction	90,000–100,000	Procedural detail combined with page-turning pace.
Historical Fiction	80,000–120,000	Requires rich world-building and period detail.
Science Fiction & Fantasy	90,000–125,000	Extensive world-building, complex magic or tech systems.

2. Non-fiction

Category	Target Word Count	Typical Pacing & Structure
Self-Help / Business / KDP Guides	40,000–70,000	Actionable, focused, fast-reading practical guides.
Traditional Non-Fiction / Memoir	70,000–110,000	Deep dives, academic research, biographies, and comprehensive histories.

3. Children’s & Young Adult (YA)

Category	Target Word Count	Typical Pacing & Structure
Picture Books	500–700	Highly visual; text leaves room for illustrations.
Middle Grade (MG) / KS2	25,000–40,000	Fast-moving plot, age-appropriate themes (35k average).
Young Adult (YA)	50,000–80,000	High emotional stakes, brisk pacing.

Why non-fiction word counts vary

If you are writing non-fiction, you might see word counts ranging anywhere from 40,000 to 110,000. The target depends heavily on your publishing route and audience:

• Traditional non-fiction (70,000–110,000 words): Academic works, major memoirs, and broad historical studies need room for exhaustive research, citations, and narrative depth.

• Indie and business non-fiction (40,000–70,000 words): Self-published authors writing on business, personal development, or niche how-to topics often aim for a leaner word count. Readers want quick, practical value without unnecessary fluff.

  
  

How word count impacts your editing budget

Because professional editing and proofreading rates are usually calculated per 1,000 words, your manuscript’s length directly dictates your production costs.

For instance, self-editing a 110,000-word cozy mystery down to a crisp 70,000 words doesn't just improve the story's pacing—it saves you significant money on your final line edit and proofread.

Trimming narrative fluff before hiring a professional ensures every pound of your editorial budget goes towards high-level polish, rather than paying an editor to fix sentences you should have cut anyway.

What if your manuscript is too long?

If your romance manuscript is sitting at 115,000 words or your business guide is pushing 90,000, readers will likely feel the drag. Over-written drafts usually suffer from:

• Repetitive concepts or internal monologue: In fiction, characters having the same realisation three different ways; in non-fiction, repeating the same core argument across multiple chapters using slightly different phrasing.

• Filter words and passive phrasing: Bloated sentence structures ("She began to notice that..." vs. "She noticed..." or "It is important to remember that you should..." vs. "Remember to...").

• Sagging middle sections and topic tangents: In fiction, subplots that wander away from the core premise; in non-fiction, long-winded background history, excessive anecdotal tangents, or over-explaining a simple point.

Self-editing tip: Read through with a focus on sentence tightness. Cutting unnecessary qualifier words (e.g., really, just, very, suddenly, started to, basically) can instantly reduce your overall count by 2% to 5% without losing a single key insight or plot point.

What if your manuscript is too short?

If your sci-fi novel ends at 45,000 words or your non-fiction guide stops short at 20,000 words, readers may feel shortchanged. Under-written drafts often stem from:

• Rushed scene transitions or skipped steps: In fiction, telling the reader what happened instead of showing the action unfold; in non-fiction, jumping from a high-level concept to a conclusion without explaining the step-by-step implementation.

• Underdeveloped subplots, evidence, or context: In fiction, missing secondary character arcs or internal motivations; in non-fiction, skimping on real-world case studies, practical examples, client stories, or addressing potential reader objections.

• Thin description or shallow analysis: In fiction, skipping sensory details that immerse the reader in the environment; in non-fiction, stating what a concept is, but failing to unpack why it matters or how the reader can apply it.

How an editor helps you hit the 'sweet spot'

Hitting your target word count isn't about padding your writing with filler or brutally slashing your favourite scenes. It's about ensuring every single word serves a clear purpose.

• If your manuscript is bloated: A developmental edit pinpointing structural cuts, combined with a copyedit to eliminate wordiness, will tighten your narrative until it leaps off the page.

• If your draft feels thin: An editorial evaluation can highlight exactly where your story or arguments need expanding, giving you a clear roadmap before you finalise your draft.

Read More: Want to make sure your draft is in the best possible shape before booking a professional? Check out my checklist on When should I send my book to an editor? to evaluate your manuscript step by step.

Get a clear picture of your manuscript’s needs

Unsure if your manuscript pacing works or whether your word count matches genre expectations? You don't have to guess.

Whether you need a structural review to tighten your draft or a final line-by-line polish before uploading to KDP, professional editorial support helps your book stand out for all the right reasons.

Request a Professional Editing Quote today to discuss your project, evaluate your word count, and prepare your book for a successful launch.

About the author

Kat Taylor is a professional proofreader and editor based in the UK, specialising in British English. She works closely with authors preparing manuscripts for submission. Learn more about Kat or explore her proofreading and editing services.

Learn More