BMI Calculator

Calculate your Body Mass Index using your height and weight. Supports metric and imperial units.

For adults 20 and older. BMI is a screening measure, not a diagnosis. CDC source

Height (cm)

Weight (kg)

BMI formula

Metric: weight (kg) ÷ height (m)²

Example: 70 ÷ 1.75² = 22.9

Imperial: weight (lb) ÷ height (in)² × 703

Example: 154 ÷ 69² × 703 = 22.7

Underweight

Below 18.5

Healthy weight

18.5 – 24.9

Overweight

25.0 – 29.9

Obesity

30.0 and above