FFMI (Fat-Free Mass Index) Calculator
Calculate your fat-free mass index (FFMI).
kg
cm
%
Result
20,9877
Normalized FFMI: 20,9877
Result in all units
Step-by-step solution
FFMI = fat-free/height² + 6,1·(1,8−height)
What Is FFMI?
FFMI (Fat-Free Mass Index) evaluates muscle mass relative to height. Unlike BMI, it excludes fat and measures muscle development.
How is it calculated?
How Is It Calculated?
FFMI = fat-free mass (kg) ÷ height² (m)
Fat-free mass = weight × (1 − body fat percentage).
- Enter your weight, height, and body fat percentage.
Frequently Asked Questions
Why is FFMI better than BMI?
BMI does not separate muscle from fat; since FFMI measures only fat-free mass, it gives more meaningful results for athletes.