BMI Calculator

years
Your Body Mass Index
--.-
Enter details


BMI Classification for Adults

BMI is a useful measure of overweight and obesity. It is calculated from your height and weight. BMI is an estimate of body fat and a good gauge of your risk for diseases that can occur with more body fat.

Classification BMI Range - $kg/m^2$
Severe Thinness < 16
Mild Thinness 16 - 18.5
Normal Weight 18.5 - 25
Overweight 25 - 30
Obese Class I 30 - 35
Obese Class II 35 - 40
Obese Class III > 40

BMI Formula

Below are the equations used for calculating BMI in the Metric and US units:

Metric Units:

$$BMI = \frac{\text{mass (kg)}}{\text{height}^2 \text{ (m)}}$$

US Units:

$$BMI = 703 \times \frac{\text{mass (lbs)}}{\text{height}^2 \text{ (in)}}$$

Why BMI Matters?

A high BMI can be an indicator of high body fatness. BMI can be used as a screening tool but is not diagnostic of the body fatness or health of an individual.