Lean Mass & FFMI Calculator
Enter weight, height, and body fat %.
FFMI
21.5
Adjusted: 21.6
- Lean mass (kg)
- 68
How it works
We subtract fat from weight to get lean mass, then divide by height² for FFMI, and normalize to a reference height of 1.8m.
Formula
FFMI = (weight × (1 − bf%)) / height²
Worked example
Weight 80, height 178, bf 15% → FFMI ≈ 21.5.
FAQ
- Normal range?
- 18–22 for non-athletes, 22–25 for serious lifters.
- Doping suspicion?
- Natural FFMI above 25 is very rare.
- Need accurate BF%?
- Yes — results scale directly with BF% accuracy.