FFMI Calculator
Calculate your Fat-Free Mass Index for muscle mass assessment
FFMI Formula
FFMI = (Lean Mass in lbs × 0.453592) / (Height in meters)²
Lean Mass = Total Weight × (1 - Body Fat % / 100)
Height in meters = Height in inches × 0.0254
Adjusted FFMI = FFMI + (6.1 × (1.8 - Height in meters))