Free Tool

KDP Spine Calculator

Get exact spine width and cover dimensions for Amazon KDP

Interactive Engineering Tool

Book Formatting Sandbox

Simulate print-ready bleed margins, inside gutters, and spine wraps based on KDP algorithms.

200 Pages
MIN: 24MED: 400MAX: 828
Adds 0.125" bleed to cover edges for wrap
Live Scale Blueprint View
Back Cover6" x 9"
0.5" Spine200 pgs
Front Cover6" x 9"
Back margin edgeSpine: 0.5"Front margin edge
Spine Width0.5"
Gutter margin0.5"
Full Cover W12.75"
Full Cover H9.25"
Print Safety CheckSince page count is 200, KDP requires an inside gutter margin of at least 0.5 inches to prevent text from being hidden in the binding.

How KDP Spine Calculation Works

Amazon KDP uses specific paper thickness multipliers to calculate spine width. Getting this right ensures your cover fits perfectly without rejection.

White Paper

Best for non-fiction, textbooks

Pages × 0.002252"

Cream Paper

Standard for fiction novels

Pages × 0.0025"

Color Paper

Premium color printing

Pages × 0.002347"

Using Both KDP and IngramSpark?

Note that IngramSpark uses slightly different spine width formulas than KDP due to variations in paper weight and manufacturing. Read our comparison guide to understand how to adjust your cover files for both platforms.

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