6 x 9 in, 400 pages: KDP inside margin
A 6 x 9 in KDP paperback with 400 pages needs an inside margin of at least 0.625 in (15.9 mm).
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First 4 corrected pages
Clean pages, no watermark.trim linesafe area for text
Margins are measured from live text; pictures, lines and shapes that end inside a margin are listed as a note. The fix does not embed fonts, sharpen pictures or reflow text. Rules read from the official KDP help pages on 10 November 2026. This is an information tool, not professional advice, and not an approval.
| 6 x 9 in, 400 pages | No bleed | With bleed |
|---|---|---|
| Inside (gutter) margin | 0.625 in | 0.625 in |
| Top, bottom, outside margin | at least 0.25 in | at least 0.375 in |
| Largest text area | 5.125 x 8.5 in | 5 x 8.25 in |
| PDF page size | 6 x 9 in | 6.125 x 9.25 in |
Source: KDP help, Set Trim Size, Bleed, and Margins. Read on 10 November 2026.
400 pages falls in the 301 to 500 band. From 501 pages the inside margin rises to 0.75 in. At 300 pages or fewer it drops to 0.5 in. Count every page in the PDF, blank ones included. The text area is calculated here from the published minimums.
On odd pages the inside margin is on the left; on even pages it is on the right. Drop your PDF above to see the margin on each page and which pages are short.
Questions
What inside margin does a 6 x 9 book with 400 pages need on KDP?
At least 0.625 in (15.9 mm). That is the KDP minimum for 301 to 500 pages, as read on 10 November 2026.
What are the other margins for 6 x 9 at 400 pages?
At least 0.25 in on the top, bottom and outside edge, or 0.375 in when the book has bleed.
All page counts
| Page count | Inside margin (gutter) | Top, bottom, outside: no bleed | Top, bottom, outside: with bleed |
|---|---|---|---|
| 24 to 150 | 0.375 in (9.6 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 151 to 300 | 0.5 in (12.7 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 301 to 500 | 0.625 in (15.9 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 501 to 700 | 0.75 in (19.1 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |
| 701 to 828 | 0.875 in (22.3 mm) | at least 0.25 in (6.4 mm) | at least 0.375 in (9.6 mm) |