6" × 9" Trim Size Guide
The standard nonfiction book size. Everything you need to know about margins, page counts, spine width, and typography for the 6×9 trim on KDP and IngramSpark.
The standard nonfiction size
At 6" × 9", this is the default trim size for nonfiction books — self-help, business, history, biography, and technical writing. It is also widely used for literary fiction, epic fantasy, science fiction, and any work that runs long.
The larger page feels more substantial in hand than the 5.5" × 8.5" trade paperback. It signals authority and depth, which is why readers expect it for serious nonfiction. For fiction authors, the practical advantage is page count: an 80,000-word novel that runs 280 pages at 5.5" × 8.5" comes in at roughly 230 pages at 6" × 9", reducing your printing cost on every copy sold.
If your book is over 100,000 words, 6" × 9" is almost always the right call. It keeps the spine reasonable, the printing cost manageable, and the book comfortable to hold. For shorter nonfiction and long fiction alike, it is a professional, reader-friendly choice.
KDP margin requirements
Minimum inside (gutter) margin
KDP sets the minimum inside margin based on page count. The gutter must be wide enough for the binding to hold without cutting into the text. These are minimums — professional formatters use wider margins for better readability.
| Page Count | Minimum Inside Margin |
|---|---|
| 24–150 pages | 0.375" |
| 151–300 pages | 0.5" |
| 301–500 pages | 0.625" |
| 501–700 pages | 0.75" |
Minimum outside margins
KDP requires a minimum of 0.25" on the outside, top, and bottom edges for books without bleed. With bleed enabled, the minimum increases to 0.375".
Recommended margins
KDP minimums will pass validation, but they produce tight, uncomfortable pages. Use these professional margins for a polished interior:
| Edge | Recommended Range |
|---|---|
| Inside (gutter) | 0.75"–0.9" |
| Outside | 0.6"–0.75" |
| Top | 0.7"–0.8" |
| Bottom | 0.8"–0.9" |
Word count to page count
These estimates assume standard formatting: 11–12pt body text, 1.35–1.5× line spacing, professional margins, and typical front/back matter. Your actual count depends on font, spacing, and chapter structure.
| Word Count | Estimated Pages |
|---|---|
| 50,000 words | ~155 pages |
| 60,000 words | ~185 pages |
| 70,000 words | ~215 pages |
| 80,000 words | ~230 pages |
| 90,000 words | ~265 pages |
| 100,000 words | ~295 pages |
| 120,000 words | ~350 pages |
| 150,000 words | ~440 pages |
For a precise number based on your manuscript, use the KDP Book Calculator or import your manuscript into Cambric to see the exact typeset page count.
Spine width calculation
Your spine width determines whether your cover designer can put text on the spine, and it is required for building the full cover template. KDP calculates spine width from your page count and paper type:
Cream paper (standard for fiction)
Spine width = page count × 0.0025"
A 230-page book on cream paper: 230 × 0.0025 = 0.575"
White paper (standard for nonfiction)
Spine width = page count × 0.002252"
A 230-page book on white paper: 230 × 0.002252 = 0.518"
KDP requires a minimum of 79 pages before allowing spine text. At 6" × 9", most books clear this easily. For paperback bindings, add 0.06" to the calculated spine width.
Font and spacing recommendations
The 6" × 9" page provides a wider text block than smaller trims, which changes how typefaces behave. A line that runs roughly 4.5"–4.8" wide (after margins) needs a typeface that reads comfortably at that measure.
Body text
- Size: 11–12pt. Nonfiction typically runs at 11pt; fiction at 11.5–12pt.
- Leading: 1.35–1.5× the font size. At 11pt, that means 14.85–16.5pt leading.
- Fonts: Wider typefaces like Palatino, Garamond, Minion Pro, and Caslon work well at this trim size. They fill the line without feeling stretched.
- Avoid: Narrow or condensed fonts. At a 4.5"+ line width, condensed faces create too many words per line and reduce readability.
Browse typeface options in our Book Fonts tool to preview how different faces look at 6" × 9". Cambric includes built-in support for all these typefaces.
When to choose 6" × 9"
Good fit
- Nonfiction: Self-help, business, history, biography, science, how-to. This is the default size readers and bookstores expect.
- Long fiction: Epic fantasy, science fiction, and literary novels over 100,000 words. Keeps page count and cost manageable.
- Literary fiction: Even at shorter lengths, 6" × 9" signals a serious, shelf-worthy book.
- Books with wider content: Tables, code listings, sidebars, and block quotes benefit from the extra page width.
Consider alternatives
- Genre romance: Readers expect a smaller, more portable size. Use 5.5" × 8.5" or 5" × 8" instead.
- Mass-market feel: If you want your book to feel like a traditional pocket paperback, 6" × 9" is too large. Go with 5" × 8".
- Short books under 40,000 words: At 6" × 9", a short book produces very few pages and can feel thin. A smaller trim fills more pages and feels more substantial.
For a side-by-side comparison of all sizes, see the Trim Size Guide. For a detailed walkthrough of choosing your trim, read KDP Trim Sizes Explained.
Related guides
- How to Format a Book for KDP — Complete formatting walkthrough from manuscript to upload.
- How to Format a Nonfiction Book for Print — Nonfiction-specific formatting, including front matter, headings, and layout.
- KDP Trim Sizes Explained — A comparison of every KDP trim size with genre recommendations.
- KDP Book Calculator — Enter your word count and see pages, spine, cost, and royalty.
- 5.5" × 8.5" Trim Size Guide — The most popular alternative trim for fiction.
FAQ
Is 6x9 too big for fiction?
What is the minimum page count for a 6x9 book on KDP?
Should I use cream or white paper for a 6x9 book?
How does 6x9 compare to 5.5x8.5 for printing cost?
What fonts work best at 6x9?
Know your trim size?
Format the book.
Cambric applies the correct margins, fonts, and page layout for 6" × 9" automatically. Pick a template, import your manuscript, and export a print-ready PDF.