body composition tool
FFMI Calculator (Fat-Free Mass Index)
Evaluate your lean muscular index and natural genetic ceiling potential using Fat-Free Mass parameters.
Interactive Calculator System
80 kg
40 kg200 kg
180 cm
120 cm220 cm
15
4 45
Real-time Calculated Outputs
Your Raw FFMI
21
Athletic Build
Height-Adjusted FFMI21.0
Muscular ClassificationAverage / Healthy
Your adjusted FFMI is 21.0, indicating a Average / Healthy tier of muscular development.
Methodology & Formula: Fat-Free Mass Index (FFMI) Formula
FFMI calculates lean tissue mass in relation to overall height, adjusting for tall frames.
• Fat-Free Mass = Weight × (1 - Body Fat%)
• FFMI = Fat-Free Mass (kg) ÷ Height (m)²
• Adjusted FFMI = FFMI + 6.1 × (1.8 - Height in meters).
Standard Reference Calculations
Lean Lifter (Adjusted FFMI 21.5)
Inputs: Height: 180cm, Weight: 80kg, Fat: 12%
Output: FFMI = 21.7 (Above Average)
Frequently Asked Questions
Get answers to common queries based on clinical literature and fitness research.
For natural male athletes, an FFMI of 25 is widely recognized as the upper physiological boundary of muscle growth without exogenous enhancements.