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.

Mathematical Formulas

• Lean Weight = Weight * (1 - (body fat % / 100)
• FFMI = (Lean Weight / 2.2)/ ((Feet * 12.0 + Inches) * 0.0254)²
• Adjusted FFMI = FFMI + ( 6.3 * (1.8 - (Feet * 12.0 + Inches) * 0.0254))

See also: Fat-free mass index in users and nonusers of anabolic-androgenic steroids.

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