What Is KDP Spine Width?
The KDP Spine Width Formula
Paper Thickness Multipliers
Paper Type Multiplier (inches per page)
White Paper 0.002252" Cream Paper 0.0025" Color Paper 0.002347"
Example Calculations
Spine = 200 × 0.002252 = **0.4504 inches**
Spine = 300 × 0.0025 = **0.750 inches**
Spine = 150 × 0.002347 = **0.3521 inches**
Full Cover Width Formula
Example: 6×9 Book, 200 Pages, White Paper
Why Spine Width Changes Over Time
Minimum Pages for a Visible Spine
Using Our Calculator
Common Spine Width Mistakes