# body mass index

body mass index a meaurement used to estimate body fat and classify persons as being underweight, overweight, or normal: it is calculated by dividing weight (in kilograms) by the square of height (in meters)

## body mass index

noun

*Abbr.*

**BMI**

A measurement of the relative percentages of fat and muscle mass in the human body, in which weight in kilograms is divided by height in meters squared and the result used as an index of obesity.

## body-mass-index

Noun

(*plural* body mass indices)

- a statistical measure of the weight of a person scaled according to height, used to estimate if a person is underweight or overweight. BMI units are defined as ≈ .