Health Logo. FFMI Calculator

FFMI is an alternative to body mass index which accounts for a person's muscle mass. The average male scores about 19 and it is hard to score above 25 without using steroids or other banned substances.

Imperial

Height: feet inches
Weight: pounds
Body fat: %

Fat-free mass: pounds
FFMI:
Normalized FFMI:

Metric

Weight: kilos
Height: meters
Body fat: %

Fat-free mass: kilos
FFMI:
Normalized FFMI:

Mathematical Formulas

  • Lean Weight = Weight * (1 - (body fat % / 100)
  • FFMI = (Lean Weight / 2.2)/ ((Feet * 12.0 + Inches) * 0.0254)2
  • Adjusted FFMI = FFMI + ( 6.0 * ( ((Feet * 12.0 + Inches) * 0.0254) - 1.8 ))