# KDP margins and gutter by page count

The minimum outside margins and the inside gutter, which grows with the page count.

Margins keep your text from being cut off or lost in the spine. KDP sets minimums; most books look better with a little more.

## Outside margins

- Without bleed: at least 0.25 in (6.3 mm).
- With bleed: at least 0.375 in (9.5 mm).

## Inside margin (gutter)

The thicker the book, the more of the page curves into the spine, so the inside margin grows with the page count:

| Pages | Minimum gutter |
| --- | --- |
| 24–150 | 0.375 in (9.5 mm) |
| 151–300 | 0.5 in (12.7 mm) |
| 301–500 | 0.625 in (15.9 mm) |
| 501–700 | 0.75 in (19.0 mm) |
| 701–828 | 0.875 in (22.2 mm) |

> kdpbookai sets the gutter from your page count and checks every page for text outside the safe area before you download.

## Sources

- Source: [KDP · Set Trim Size, Bleed, and Margins](https://kdp.amazon.com/en_US/help/topic/GVBQ3CMEQW3W2VL6), checked 2026-11-07.
---

Page: https://kdpbookai.com/guides/kdp-margins-and-gutter · Checked 2026-11-09

Independent product. Not affiliated with Amazon. KDP and Kindle are trademarks of Amazon.com, Inc. kdpbookai is not connected to kdpbook.io or any other similarly named service.