5″ × 8″ Trim Size Guide
A compact trade paperback for fiction: compare the real page-count, margin, typography, and cover tradeoffs before committing your manuscript.
What is the 5″ × 8″ trim size?
The 5″ × 8″ trim is a compact trade paperback, not the smaller rack format used by many traditional publishers. If that is the product you are trying to match, start with the mass market paperback size guide and compare the closest print-on-demand choices before composing the book.
The smaller page can also increase page count. That changes the spine, manufacturing cost, cover template, and sometimes the retail price you need. Your typeface, font size, line spacing, margins, paragraph treatment, and chapter-open style all affect the final result.
Amazon KDP and IngramSpark both support 5″ × 8″ in eligible print configurations, but they do not share one universal production template. Confirm the binding, ink, paper, bleed, and page-count options in the platform you will actually use.
Margins & requirements
The table below shows KDP's current paperback minimum inside margins. Treat them as production constraints; a readable design may need more space.
KDP minimum inside (gutter) margin
| 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″ |
| 701 – 828 pages | 0.875″ |
Recommended margins for professional interiors
| Margin | Recommended Range |
|---|---|
| Inside (gutter) | 0.7″ – 0.8″ |
| Outside | 0.5″ – 0.55″ |
| Top | 0.6″ – 0.7″ |
| Bottom | 0.7″ – 0.8″ |
The recommendations are starting ranges, not platform rules. Proof several representative pages and inspect the physical proof. Use our KDP Book Calculator for planning, then use the final composed PDF page count for production decisions.
Word count to page count
These are planning scenarios based on 11pt body text, roughly 1.4× leading, and the margin ranges above. They are not a substitute for composing the real manuscript.
| Word Count | Estimated Pages |
|---|---|
| 50,000 | ~215 |
| 60,000 | ~255 |
| 70,000 | ~295 |
| 80,000 | ~340 |
| 90,000 | ~380 |
| 100,000 | ~420 |
Try the KDP Book Calculator to compare scenarios. Only your final typeset PDF provides the actual production page count, and the printer's live calculator or proof determines the current cost.
KDP paperback spine estimate
KDP's current paperback spine factor depends on the selected paper. The examples below are for KDP only; always generate the official cover template after the interior page count is final.
| Paper Stock | Formula | Example (300 pages) |
|---|---|---|
| Cream / off-white | page count × 0.0025″ | 0.75″ |
| White | page count × 0.002252″ | 0.676″ |
Font & layout recommendations
The 5″ × 8″ trim has a narrow text block, so your typography choices need to work within tight horizontal space. Here is what works well:
Body text size
10.5 – 11pt. Anything smaller strains the eye; anything larger eats through pages and inflates printing costs. 11pt is the sweet spot for most fiction at this trim.
Line spacing (leading)
1.3 – 1.5× the body size. At 11pt, that means 14.3 – 16.5pt leading. Tighter leading (1.3×) reduces page count; looser leading (1.5×) improves readability. For genre fiction, 1.4× is a strong default.
Recommended fonts
Garamond, Caslon, Baskerville. These are the workhorses of book typography — designed for sustained reading at small sizes. They set efficiently (more words per line than wider faces) and look correct to readers who have spent years with traditionally published paperbacks. Browse options with our book font finder.
Paragraph style
First-line indent, no space between paragraphs. This is the standard for fiction. Use a 0.25″ – 0.35″ indent. Block paragraphs (space between, no indent) waste vertical space at this trim size and are better suited to nonfiction at 6″ × 9″.
Who should use 5″ × 8″
This trim size works best for books that readers consume quickly and in volume. The compact format is part of the reading experience — it signals a fast, immersive read.
Romance
A useful compact option, especially when comparable titles in your subgenre use it. Check the physical books your readers already buy rather than assuming one default. If you are formatting a romance novel for print, compare the page count at 5″ × 8″ and 5.5″ × 8.5″.
Thriller & Mystery
Fast-paced stories benefit from the compact format. Thrillers and mysteries at this size match what readers see from major publishers. The page count for a typical 70,000–90,000 word thriller (295–380 pages) sits in the sweet spot for printing costs.
Horror
Horror paperbacks have been printed at this size since the 1970s. The format carries genre expectations. A slim horror novel (50,000–70,000 words) produces a 215–295 page book that feels right in readers' hands.
Genre fiction (general)
Westerns, action-adventure, military fiction, and other text-led categories can work well at this trim. Compare nearby books in the same storefront category. For a roomier alternative, consider 5.5″ × 8.5″.
Frequently asked
Is 5″ × 8″ a good size for romance novels?
How many pages is 80,000 words in a 5″ × 8″ book?
What margins do I need for a 5″ × 8″ book on KDP?
What is the difference between 5″ × 8″ and 5.5″ × 8.5″?
Can I use 5″ × 8″ on IngramSpark?
Ready to format your 5″ × 8″ book?
Cambric gives you a live book preview and the final composed PDF page count, so you can judge the 5″ × 8″ layout before ordering a cover template. Choose a design, import your manuscript, review the pages, and export the interior PDF. Read our guide to formatting a book for KDP, then confirm KDP's current requirements before upload.