Tool
FFMI calculator
FFMI (Fat-Free Mass Index) is the lifting community's standard yardstick for "how big, drug-free" — lean mass normalized to height, which tracks the first-glance physique read far better than weight or BMI. Enter three numbers to calculate; every score from 16-28 is broken down below.
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Your result
Lean body mass
61.5 kg
FFMI
19.4
Normalized FFMI
19.5
Normalized adjusts to a 1.80 m reference height so tall and short lifters compare on the same scale.
What 20 FFMI means →The formula
FFMI = lean body mass (kg) ÷ height (m)²; normalized FFMI adds 6.1 × (1.8 − height). Lean body mass = weight × (1 − body fat). Kouri et al. (1995) studied natural bodybuilders and found ~25 as a practical natural ceiling — small sample, useful as a reference frame, not a law.
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FFMI is only half the physique signal
1 minute. The AI combines physique × face × outfit and reads what the 1.2-second first impression actually registers — plus your ceiling.