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Body Mass Index (BMI)

Definition:

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults.

It is defined as the weight in kilograms divided by the square of the height in metres (kg/m2).

BMI = weight (kg)
――――――――――――――――
height (m) x height (m)

For example, an adult who weighs 70kg and whose height is 1.75m will have a BMI of 22.9.

BMI = 70 (kg)
――――――――――――――――
1.75 (m) x 1.75 (m)
= 22.9

BMI values are age-independent and the same for both sexes.

Source: WHO BMI classification 

More:

The International Classification of adult underweight, overweight and obesity according to BMI:

BMI Weight Status
less than 18.5 Underweight
18.5–24.9 Normal
more than 25.0 Overweight

Overweight can be further subdivided in:

BMI Weight Status
25.0–29.9 Pre-obsese
30.0-34.9 Obese class I
35.0-39.9 Obese class II
40.00 or more Obese class III

Compared to a normal weight status, the risk of having additional diseases (comorbidity) becomes greater with increasing overweight.

Source: GreenFacts, based on WHO BMI classification 

To calculate your own BMI automatically (in English or metric units) see:

BMI Calculator  of the Mayo Clinic

Related words:

Obesity

Translation(s):

Deutsch: Body Mass Index (BMI)
Español: Índice de masa corporal (IMC)
Français: Indice de masse corporelle (IMC)

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