Calculate your Fat Free Mass Index — the gold standard for evaluating muscle development relative to height. Includes normalized FFMI, lean mass analysis, and physique classification.
Enter your body measurements to calculate FFMI
Use DEXA, calipers, or a body fat scale
🔍 Don't know your body fat? Use the Navy Method estimator
FFMI = Fat-Free Mass (kg) ÷ Height (m)². Normalized FFMI adjusts for height using: FFMI + 6.1 × (1.8 − Height in m). Reference: Kouri et al., 1995. Values are for males; female ceilings are approximately 6 points lower.