Index for Fat-Free Body Mass

Divide measured fat-free body mass by height squared.

Your numbers

FFMI

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For personal measurement and planning, no be diagnosis, treatment or training prescription. Measurement error and differences between people affect results.

Health inputs stay for this tab. Link sharing no dey available.

Formula

Use FFMI = W(1−f)/h². W na body mass for kg, f na measured body fat as decimal fraction, and h na height after you convert am to m. Di index dey for kg/m².

Divide measured fat-free body mass by height squared.

Example wey show the calculation

Di body mass (kg): 75
Height (cm): 180
Body fat wey you measure (%): 20

FFMI: 18.5185 kg/m²
Body mass wey no include fat: 60 kg

Where e fit work and limits

For personal measurement and planning, no be diagnosis, treatment or training prescription. Measurement error and differences between people affect results.

We check inputs for missing values and allowed ranges. Result wey pass the finite numeric range no go show. Rounding affect wetin display, while calculation use the model numeric precision.

Check your units and assumptions before you rely on result. Changing label no convert currency or physical unit.

Version of di formula: 54d0e6d1c6df · Example don get check: 2026-10-30

Method