What is body mass index?

The body mass index (BMI) is a measure of weight relative to height and is commonly used to determine if your body weight is healthy, underweight, overweight or obese. BMI is defined as the weight in kg divided by the square of the height in meters. Note that BMI calculation is age-independent and the same for both sexes i.e., The same formula is used for both adult males and females. However, for children under 18 years of age, BMI values are interpreted based on sex- and age-specific percentiles.

BMI Scale

The following table summarizes the nutritional status of adults according to BMI values.

BMI Classification (Source: WHO)
Body Weight BMI Range
Underweight <18.50
Normal weight 18.50 - 24.99
Pre-obesity 25.00 - 29.99
Obesity class I 30.00 - 34.99
Obesity class II 35.00 - 39.99
Obesity class III >=40.00

BMI Calculator

Use this calculator to quickly find your BMI. Height and weight values may be entered either in metric or imperial units. Download our Android App from play store.

Metric Imperial
Height: cm
Weight: Kg
Height: ft in
Weight: lb

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