Amazon KDP Margin & Gutter Requirements: The Complete Safe Zone Cheat Sheet

The #1 reason KDP manuscripts are rejected during the manual review phase is improper gutter margin sizing. When a physical book is bound, the inner glue or stitching swallows a fraction of the interior page. If your text or puzzle lines sit too close to the spine, readers cannot see the content without cracking the spine. Here is Amazon's official formula simplified.

What is the Gutter Margin?

The gutter margin is the extra space added to the inside margin of a book page (the edge closest to the binding). For left-hand pages (even numbers), the gutter is on the right. For right-hand pages (odd numbers), the gutter is on the left.

Official Amazon KDP Gutter Margin Table

Your required inside gutter depends strictly on total book page count: - **24 to 150 Pages**: 0.375 in (9.6 mm) minimum gutter - **151 to 300 Pages**: 0.500 in (12.7 mm) minimum gutter - **301 to 500 Pages**: 0.625 in (15.9 mm) minimum gutter - **501 to 700 Pages**: 0.750 in (19.1 mm) minimum gutter - **701 to 828 Pages**: 0.875 in (22.3 mm) minimum gutter

Outer, Top, and Bottom Minimum Margins

Regardless of page count, your outer margins must maintain at least: - **Without Bleed**: 0.25 in (6.4 mm) on top, bottom, and outside edges. - **With Bleed**: 0.375 in (9.6 mm) safe zone from all trim lines to ensure text is never clipped during mechanical paper slicing.

How KDPage Automates Margins

Manually setting mirrored margins in Microsoft Word or InDesign is tedious and error-prone. In KDPage Studio, select your trim size and page count, and our compiler automatically computes exact mirrored gutters on alternating odd/even pages, ensuring 100% compliance on the first upload.