Find the perfect trim size for your Amazon KDP paperback. Use the genre selector below to see recommended sizes, or browse the complete filterable table of all available KDP trim sizes.
Choose Your Genre
Click a genre to see the recommended trim sizes and UK publishing conventions:
Fiction / Novels
5" x 8", 5.25" x 8", 5.5" x 8.5", 6" x 9"
UK B-format equivalent: 5.5" x 8.5"
Non-Fiction / Self-Help
5.5" x 8.5", 6" x 9", 7" x 10"
UK Royal format equivalent: 6.14" x 9.21"
Memoir / Biography
5.5" x 8.5", 6" x 9"
UK Demy format equivalent: 5.5" x 8.5"
Children's Books
8.5" x 8.5", 8.25" x 8.25", 8.5" x 11"
Square formats popular for picture books
Poetry
5" x 8", 5.25" x 8", 5.5" x 8.5"
Smaller sizes suit the intimate feel of poetry
Textbooks / Workbooks
7" x 10", 8" x 10", 8.5" x 11"
Larger sizes for tables, diagrams, and exercises
Photography / Art Books
8.5" x 8.5", 8" x 10", 8.5" x 11"
Bleed required for full-page images
Romance
5" x 8", 5.25" x 8", 5.5" x 8.5"
Mass-market feel: 5" x 8" is closest to UK A-format
Visual Size Comparison
Sizes shown at relative scale. Click a genre above to highlight recommended sizes.
Complete KDP Trim Size Table
Filter and search all available Amazon KDP trim sizes:
| Trim Size (in) | Metric (mm) | Bleed | No-Bleed | Best For | Notes |
|---|
UK Publishing Size Equivalents
For UK authors, here is how traditional British book formats map to KDP trim sizes:
| UK Format | UK Size (mm) | Closest KDP Size | KDP Size (mm) |
|---|---|---|---|
| A-format (mass market) | 110 x 178 | 5" x 8" | 127 x 203 |
| B-format (standard) | 129 x 198 | 5.25" x 8" or 5.5" x 8.5" | 133 x 203 or 140 x 216 |
| C-format (trade) | 135 x 216 | 5.5" x 8.5" | 140 x 216 |
| Demy | 138 x 216 | 5.5" x 8.5" | 140 x 216 |
| Royal | 156 x 234 | 6.14" x 9.21" | 156 x 234 |
| Crown Quarto | 189 x 246 | 7.44" x 9.69" | 189 x 246 |
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