FFMI Calculator

Estimate fat-free mass index from height, weight, and body-fat percentage, with normalized FFMI where supported.

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FFMI & Lean Body Mass Calculator

Fat-Free Mass Index (FFMI) measures your muscle mass relative to height. Height-normalized at 1.8 m reference for fair comparison.

Disclaimer: This tool provides informational results only and should not be used as professional advice.

The FFMI Calculator estimates fat-free mass index from height, weight, and body-fat percentage.

$\text{Fat-free mass}=\text{Weight}\times(1-\text{Body-fat fraction})$ $\text{FFMI}=\frac{\text{Fat-free mass in kg}}{\text{Height in metres}^2}$

Body-fat measurement error directly affects FFMI. The result is not a diagnosis, drug-use assessment, or personalized target.

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