Nonfiction has a shortcut fiction doesn't: you can sell the book before you've written it. The document that makes that possible is the book proposal, and it's what agents and editors judge your idea on.
This guide covers how to write a book proposal section by section, with a free book proposal template you can copy, typical length, and the mistakes that get proposals passed over. It's written for nonfiction authors, including memoirists.
What is a book proposal?
A book proposal is a business case for your book. It tells an agent or editor what the book is, who will buy it, why you're the one to write it, and how it will reach readers.
Most nonfiction is sold this way. Jane Friedman's guide to book proposals notes that nonfiction authors can write the proposal first, and that even a finished manuscript doesn't replace one. Memoir is the main exception: published writers can typically sell a memoir on a proposal alone, but first-time memoirists are often asked for more of the book.
What are the sections of a nonfiction book proposal?
A standard nonfiction book proposal has these parts. Names vary by agent, but the content is consistent.
| Section | What it does | Typical length (estimate) |
|---|---|---|
| Overview | Sells the idea, the hook and why now | 2–5 pages |
| Target audience | Defines who buys the book and why | 1–2 pages |
| About the author | Shows your expertise and credibility | 1–2 pages |
| Author platform | Shows your existing reach to readers | 1–3 pages |
| Comparable titles | Positions your book against recent books | 2–4 pages |
| Marketing and promotion plan | What you'll do to help sell the book | 1–3 pages |
| Chapter outline | Summarizes every chapter | 3–8 pages |
| Sample chapters | Proves you can write the book | 1–2 chapters |
Some proposals also include a short title page, a table of contents, and a list of manuscript details such as estimated word count and delivery date.
How to write a book proposal, section by section
1. Overview
The overview is the most important part, and the one agents read first. It should open with a hook (a story, a problem or a striking question), state the big idea in plain language, and explain why this book is needed now.
Include the essentials near the end: working title, estimated length, and how long you'll need to finish the manuscript. Friedman suggests writing the overview last, once everything else is clear, because it works as the proposal's executive summary.
2. Target audience
Describe your reader specifically. "Business readers" is too broad. "First-time managers at companies of 50 to 500 people who were promoted for technical skill" tells an editor exactly who will buy the book.
Explain what that reader wants, where they already look for answers, and why they'll pay for this book. Avoid claiming that "everyone" will want it.
3. About the author
This is your credentials section. Cover your professional experience, relevant results, education, past publications and any media coverage.
Write it in the third person and keep it focused on why you're qualified to write this book, not your full life story. Our author bio examples show how to make this section concise.
4. Author platform
Platform means your existing, measurable ability to reach readers. Publishers weigh it heavily for nonfiction, especially prescriptive and business books.
List what you have, with real numbers:
- Email newsletter subscribers and open rates
- Social media following where your readers are
- Speaking engagements per year and typical audience sizes
- Regular columns, articles or media appearances
- Podcast appearances or a podcast you host
- Organizations, communities or clients you can reach
Only include what's true and current. Editors check, and inflated numbers undermine everything else in the proposal.
5. Comparable titles
Comparable titles (comps) show that readers already buy books like yours, and how yours is different. Friedman says the analysis typically includes 5 to 10 titles, and advises against claiming your book has no competition.
Pick recent books that sold well and are still in print. A Writer's Digest article on proposals recommends about five comps published in the last three years. For each one, give the title, author, publisher and year, then a short paragraph on what it does and how your book differs.
6. Marketing and promotion plan
Editors want to know what you'll do, not what you hope the publisher will do. Make it concrete: specific actions, channels and numbers you can commit to.
Strong plans often include an email launch sequence, speaking dates, articles you can place, organizations willing to promote the book, bulk-order possibilities and podcast interviews timed to launch. Our book marketing plan guide shows how to structure this.
7. Chapter outline
Give each chapter a title and a summary of one to three paragraphs. Each summary should make clear what the reader learns and why the chapter matters, not just list topics.
If you've already outlined your book, start from that. Our book outline templates include argument-led and how-to formats you can adapt for a proposal.
8. Sample chapters
Include one or two of your strongest chapters, fully edited. For prescriptive nonfiction, the introduction alone often isn't enough, because it promises but doesn't deliver; include a chapter that shows the method in action. For memoir, the opening chapters are usually expected.
Key takeaway: The overview sells the idea, the platform and marketing sections sell you, and the sample chapters prove you can deliver. A proposal that's strong on only one of those three usually doesn't sell.
What does a book proposal template look like?
Copy this book proposal template into your document and replace the bracketed text. Adjust section names to match any guidelines the agent or publisher gives.
BOOK PROPOSAL
[Working Title]: [Subtitle]
by [Author Name]
[Email] | [Phone] | [Website]
[Agent name and agency, if represented]
TABLE OF CONTENTS
Overview ................................ page
Target Audience ......................... page
About the Author ........................ page
Author Platform ......................... page
Comparable Titles ....................... page
Marketing and Promotion Plan ............ page
Chapter Outline ......................... page
Sample Chapter(s) ....................... page
-----------------------------------------------------------
OVERVIEW
- Hook: [Opening story, problem or question]
- The big idea: [One paragraph, plain language]
- Why now: [What's changed that makes this book timely]
- What readers get: [The result or new understanding]
- Book details:
- Estimated length: [XX,000 words]
- Manuscript delivery: [X months after contract]
- Special features: [Exercises, worksheets, illustrations]
TARGET AUDIENCE
- Primary reader: [Specific description]
- What they want and struggle with:
- Where they already look for answers:
- Secondary audiences: [e.g. companies buying for teams]
ABOUT THE AUTHOR
[Third-person bio, focused on credentials for this book]
AUTHOR PLATFORM
- Email list: [number] subscribers
- Social: [platform, number] where readers are
- Speaking: [events per year, typical audience]
- Media and writing: [outlets, columns, podcasts]
- Networks and partners: [organizations that will help]
COMPARABLE TITLES
1. [Title], [Author] ([Publisher], [Year])
[What it does well; how this book differs]
2. [Repeat for each comp]
MARKETING AND PROMOTION PLAN
- Launch email plan:
- Speaking and events:
- Articles and media:
- Podcast interviews:
- Partner and bulk-sale opportunities:
- Ongoing promotion after launch:
CHAPTER OUTLINE
Introduction: [Title]
[1-3 paragraph summary]
Chapter 1: [Title]
[1-3 paragraph summary]
[Repeat for every chapter]
SAMPLE CHAPTER(S)
[Chapter title]
[Full, edited chapter text]
How long should a book proposal be?
It varies by project and agent, so treat any number as a guide. Jane Friedman's proposal guide puts most proposals at about 10 to 25 double-spaced pages, not counting sample chapters. With one or two sample chapters attached, the full package is considerably longer.
Length matters less than density. Every page should help an editor say yes; cut anything that's filler.
How do book proposals relate to query letters and literary agents?
Most traditionally published nonfiction goes through a literary agent, and the process usually runs like this:
- Finish the proposal, including sample chapters.
- Research agents who represent your category and are open to queries.
- Send a query letter following each agent's guidelines.
- Send the proposal when asked, or with the query if the guidelines allow.
- Revise with your agent, who then submits the proposal to editors at publishers.
Jane Friedman's guide to nonfiction query letters is clear that you should have a finished, polished proposal ready before you query, and suggests a query of about one to one and a half single-spaced pages. A strong proposal overview often becomes the basis of your query letter.
Some smaller and independent publishers accept proposals directly from authors. Check each publisher's submission page before sending anything.
What are the most common book proposal mistakes?
- Writing the book instead of the proposal. The proposal is a sales document; it should be persuasive, not a long excerpt.
- A vague audience. "Anyone who wants to be happier" tells an editor nothing about how to sell the book.
- No comps, or the wrong comps. Claiming nothing like your book exists, or comparing yourself only to all-time bestsellers.
- Platform puffery. Rounding up numbers or listing accounts with no real engagement.
- A wish-list marketing plan. "I'd love to appear on major TV shows" isn't a plan. Specific, committed actions are.
- Summaries that list topics. Chapter summaries should show the argument and the reader's payoff.
- Weak sample chapters. Sending an unedited draft, or only the introduction.
- Ignoring guidelines. Agents tell you what they want. Following it is the easiest way to look professional.
Tip: Before you send it, ask someone who's never heard your idea to read only the overview. If they can't tell you who the book is for and why it matters, revise the overview before anything else.
How do you strengthen your platform before submitting?
If your platform section feels thin, you can build it in the months before you submit. Start an email newsletter on your topic, write articles for publications your readers trust, speak at industry events and appear as a guest on podcasts your readers listen to.
Podcast interviews are useful twice: they grow your audience now, and they become concrete evidence for the platform and marketing sections. If you'd rather not handle the pitching yourself, our podcast book tour service researches and books shows for nonfiction authors.
What should you do next?
Start with your comparable titles and your reader. Those two sections shape everything else, including your overview and marketing plan.
Then outline every chapter, write your strongest sample chapter, and write the overview last. If you're still at the idea stage, our guide to how to write a nonfiction book covers what comes before the proposal.
