Book layout for a nonfiction book: trim size, margins, the parts of a page, and how to get it done
Book layout, also called interior design or typesetting, turns your edited manuscript into the pages a reader holds. Good layout is invisible: the reader just finds the book easy to read. Here are the decisions you will make, the printer's rules you have to meet, and the three ways to get it done.
On this page
1. Choose a trim size
Trim size is the finished size of the printed page. Amazon KDP's help on trim size, bleed and margins says the most common trim size for paperbacks in the U.S. is 6 x 9 inches, and lists these regular sizes for black ink on white paper, each for books of 24 to 828 pages:
| Trim size (inches) | Trim size (cm) |
|---|---|
| 5 x 8 | 12.7 x 20.32 |
| 5.06 x 7.81 | 12.85 x 19.84 |
| 5.25 x 8 | 13.34 x 20.32 |
| 5.5 x 8.5 | 13.97 x 21.59 |
| 6 x 9 | 15.24 x 22.86 |
From Amazon KDP Help, read November 1, 2026. Other sizes and hardcover options are listed on the same page.
Pick the size before layout starts, because it decides how many words fit on a page and how long the finished book is. A larger page holds more words; a smaller one feels more like a trade paperback. Look at a few books in your category on a store shelf and match what readers expect. Page count also affects your printing cost and spine width; see how long a nonfiction book should be.
2. Margins and bleed
The inside margin, or gutter, has to be wider in thicker books so the text does not disappear into the binding. Amazon KDP's minimums:
| Page count | Minimum inside (gutter) margin |
|---|---|
| 24 to 150 pages | 0.375 in (9.6 mm) |
| 151 to 300 pages | 0.5 in (12.7 mm) |
| 301 to 500 pages | 0.625 in (15.9 mm) |
| 501 to 700 pages | 0.75 in (19.1 mm) |
| 701 to 828 pages | 0.875 in (22.3 mm) |
From Amazon KDP Help, read November 1, 2026. Outside margins (top, bottom and outer edge) must be at least 0.25 in without bleed or 0.375 in with bleed.
These are minimums, not targets. Most well-designed books use noticeably wider margins so the text block has room to breathe and readers have somewhere to put their thumbs.
Bleed means an image or color runs off the edge of the page. KDP says pages are trimmed by cutting 0.125 inches from the top, bottom and outside edges, so anything meant to reach the edge must extend 0.125 inches past the trim line. Most text-only nonfiction books do not need bleed.
3. The parts of a page
- Text block: the area where the body text sits, inside the margins.
- Running head: the line at the top that repeats the book or chapter title, often the book title on left pages and the chapter title on right pages.
- Folio: the page number, at the top or bottom.
- Body font: a readable serif typeface is the usual choice for printed nonfiction; the exact size depends on the font and the trim.
- Leading: the space between lines. Too tight feels crowded; too loose breaks the reading rhythm.
- Headings: chapter titles and section headings, styled consistently so readers can scan.
4. Chapter openings and front matter
Chapters usually start on a new page, often a right-hand page, with the chapter number and title, extra space above, and no running head. Many books also style the first few words of each chapter differently, such as in small capitals.
The front matter comes in a set order: title pages, copyright page, dedication and epigraph, then the table of contents. This guide covers each one: the copyright page, the dedication, the epigraph, the table of contents and the author's note. At the back, see the appendix and acknowledgments.
5. Template, software or designer
| Option | Good for | Trade-off |
|---|---|---|
| A Word template | Simple text-only books on a tight budget; KDP offers free paperback manuscript templates set to its trim sizes | Limited control over typography; easy to make small layout mistakes |
| Book layout software | Authors who want a polished result and will learn a tool | A learning curve; some tools cost money or run on one platform only |
| A professional designer | Books with images, tables, sidebars or a high bar for design | Costs more; build in time for a round of proofs |
Scribe Media's guidance. KDP's templates are listed in its help under paperback and hardcover manuscript templates.
Whichever you choose, lay out the book only after editing is finished. Every change after layout can move lines and pages. Choosing how to publish covers who handles layout under each publishing path.
6. Check the proof
Order a printed proof and read it on paper. Check that every chapter starts where it should, page numbers and running heads are right, the table of contents matches the pages, nothing is cut off at the edges, and no heading sits alone at the bottom of a page. Then fix only errors; a rewrite at this stage can reflow every page that follows.
Start here: pull three books from your category off the shelf, measure them, and pick the trim size that matches. That one decision unlocks the rest of the layout.
Common questions
What is the most common book size?
Amazon KDP's help says the most common trim size for paperbacks in the U.S. is 6 x 9 inches. Smaller sizes such as 5.5 x 8.5 and 5 x 8 inches are also common for nonfiction.
What margins should a book have?
Amazon KDP sets minimums: an inside (gutter) margin from 0.375 inches for books of 24 to 150 pages up to 0.875 inches for 701 to 828 pages, and outside margins of at least 0.25 inches without bleed or 0.375 inches with bleed. Most designers use more than the minimum so the text is comfortable to read.
What is bleed in book layout?
Bleed is when an image or color runs to the edge of the page. Amazon KDP says pages are trimmed by cutting 0.125 inches from the top, bottom and outside edges, so anything meant to reach the edge has to extend 0.125 inches past the trim line.
Can I lay out my book in Word?
Yes. Amazon KDP offers free paperback manuscript templates for Word set to its trim sizes. Dedicated layout software or a professional designer gives more control over typography and page details.
What is a running head?
The line at the top of a printed page that repeats the book title or chapter title. Running heads usually sit on interior pages and are left off chapter opening pages.
Sources: Amazon KDP Help, trim size, bleed and margins (most common U.S. paperback trim; regular trim sizes; inside margin by page count; outside margins; 0.125 in bleed), read November 1, 2026. Front matter order follows The Chicago Manual of Style, chapter 1, as cited in this guide's front matter pages. The options table and other guidance were written by Scribe Media. Published by Scribe Media.