KDP margins and gutter, by page count

KDP's minimum inside margin (the gutter) depends on the page count. The numbers below are KDP's minimums, read from kdp.amazon.com on 2026-10-20.

Inside margin (gutter)

Pages	Minimum inside margin
24 to 150	0.375 in
151 to 300	0.500 in
301 to 500	0.625 in
501 to 700	0.750 in
701 to 828	0.875 in

Outside margins (top, bottom and outside edge)

Book	Minimum
Without bleed	0.250 in
With bleed	0.375 in

In KDP's words

"The top, bottom, and outside margins must be a minimum of 0.25 inches for books without bleed and 0.375 inches (9.6mm) for books with bleed."
KDP, Set Trim Size, Bleed, and Margins
"The spaces that extend outside the margins are considered text characters"
KDP, Fix Paperback and Hardcover Formatting Issues

"Is your content outside the margins? Does it extend into the gutter?"
KDP, Fix Paperback and Hardcover Formatting Issues
"The inside margin size depends on the page count"
KDP, Set Trim Size, Bleed, and Margins