Fat-Free Mass Index (FFMI) & Normalized Natural Muscular Potential Calculator
Calculate your Fat-Free Mass Index (FFMI) and Height-Normalized FFMI according to the landmark Kouri et al. study to assess muscle development and natural genetic ceiling in bodybuilding and strength athletics.
Height-Normalized FFMI
Calculator Inputs
Height-Normalized FFMI
Raw Unadjusted FFMI
Total Fat-Free Mass (FFM in kg)
Raw FFMI vs Height-Normalized FFMI Comparison
Standard physique benchmarking formula used in sports science and drug-free natural bodybuilding.
This tool is a mathematical wellness and fitness estimation model for general educational guidance only. The results do not constitute medical diagnosis, clinical advice, or treatment plans. Always consult a qualified physician or certified dietitian before starting any dietary regimen, exercise program, or making health decisions.
Calculation Methodology
FFM (kg) = Weight * (1 - Body Fat% / 100). Raw FFMI = FFM / (Height in meters)^2. Normalized FFMI = Raw FFMI + 6.1 * (1.8 - Height in meters).
Frequently Asked Questions
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