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What Is Book Page Size Conversion
Book page size conversion translates dimensions between publishing standards and measurement systems used in print production. Different countries, publishers, and printing methods use different standard page sizes — US trade books use different dimensions than UK books, academic papers differ from mass-market paperbacks, and digital formats have their own specifications.
Understanding page sizes is essential for authors, self-publishers, graphic designers, and print production professionals who need to prepare manuscripts, design covers, and configure print settings across different publishing platforms and printing services.
Standard Book Sizes
| Format | Size (inches) | Size (mm) | Common Use |
|---|---|---|---|
| Mass Market Paperback | 4.25 x 6.87 | 108 x 175 | Genre fiction, airport books |
| Trade Paperback (US) | 5.5 x 8.5 | 140 x 216 | Non-fiction, literary fiction |
| Trade Paperback (US Large) | 6 x 9 | 152 x 229 | Non-fiction, textbooks |
| Royal | 6.14 x 9.21 | 156 x 234 | UK standard paperback |
| Crown Quarto | 7.44 x 9.69 | 189 x 246 | Illustrated books, cookbooks |
| A4 | 8.27 x 11.69 | 210 x 297 | Academic, technical manuals |
| A5 | 5.83 x 8.27 | 148 x 210 | Journals, notebooks |
| US Letter | 8.5 x 11 | 216 x 279 | Reports, manuscripts |
| Digest | 5.5 x 8.5 | 140 x 216 | Magazines, comics |
Common Use Cases
- Self-publishing setup: Determine the correct page dimensions for platforms like Amazon KDP, IngramSpark, or Lulu based on your book's genre and format
- Cover design: Calculate cover dimensions including spine width, bleed area, and wrap-around for both paperback and hardcover formats
- International publishing: Convert between US customary and metric page sizes when publishing for different markets
- Print-on-demand configuration: Set up trim size, margins, and gutter spacing for print-on-demand services that require precise specifications
- Manuscript formatting: Prepare manuscripts with correct page dimensions, margins, and gutter widths before submitting to publishers or formatters
Best Practices
- Include bleed in calculations — Print-ready files need 3mm (0.125") bleed beyond the trim edge on all sides. Final file dimensions are larger than the finished page size.
- Account for gutter margin — The gutter (inner margin) needs extra space for binding. Thicker books need wider gutters — typically 0.5-0.75" for books over 200 pages.
- Check printer specifications — Each print service has minimum and maximum page sizes, specific bleed requirements, and supported paper weights. Verify before designing.
- Consider reading comfort — Larger fonts need larger pages. A 6x9 book works well for standard text, but a 5x8 may be too cramped for readers who prefer larger type.
- Test with a proof — Always order a printed proof before approving a full print run. Screen dimensions do not accurately represent physical page proportions.
Frequently Asked Questions
Common questions about the Book Page Size Converter
The most common trim size for trade paperback books is 6 inches by 9 inches. This size is considered the industry standard because it offers a good balance between readability, portability, and cost-effectiveness for printing. It works well for both fiction and nonfiction genres and is widely supported by print-on-demand services like Amazon KDP.
ℹ️ Disclaimer
This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to or stored on our servers. While we strive for accuracy, we make no warranties about the completeness or reliability of results. Use at your own discretion.