Fat Mass Index
Scale measured fat mass by height squared.
Your numbers
FMI
For personal measurement and planning, not diagnosis, treatment or a training prescription. Measurement error and individual differences affect results.
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Formula
Use FMI = Wf/h². W is body mass in kg, f is measured body fat as a fraction, and h is height converted to m. The index is in kg/m².
Scale measured fat mass by height squared.
Worked example
- Body mass (kg)
- 75
- Height (cm)
- 180
- Measured body fat (%)
- 20
- FMI
- 4.62963 kg/m²
- Fat mass
- 15 kg
Scope and limitations
For personal measurement and planning, not diagnosis, treatment or a training prescription. Measurement error and individual differences affect results.
Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.
Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.
Formula version: d530e5742e37 · Example checked: