FFMI Calculator

Calculate Fat-Free Mass Index (FFMI) to assess muscle mass relative to height. Evaluate lean body mass and muscle development.

Body Composition

Results

Enter body composition to calculate FFMI

About FFMI

  • • FFMI = (Lean Mass / Height²) + 6.1 × (1.8 - Height)
  • • Normal range: 16-18 (men), 14-16 (women)
  • • Athletic: 18-20 (men), 16-18 (women)
  • • Elite: 20+ (men), 18+ (women)