Health Calculators
BMI Calculator
Calculate your Body Mass Index from your height and weight, and see your category and healthy weight range.
About the BMI Calculator
The BMI calculator estimates whether your weight is in a healthy range for your height. Body Mass Index is a widely used screening figure that places adults into underweight, normal, overweight or obese categories.
Enter your measurements in metric (kg/cm) or imperial (lb/ft) units and the tool returns your BMI, its category, and the healthy weight range for your height.
How to use the BMI Calculator
- Choose metric or imperial units.
- Enter your height and weight.
- Click Calculate BMI to see your index and category.
How the calculation works
BMI = weight (kg) ÷ height (m)²
Categories: below 18.5 underweight · 18.5–24.9 normal · 25–29.9 overweight · 30 and above obese.
Example
A person who is 170 cm and 65 kg has a BMI of 22.5, which falls in the normal range.
Frequently asked questions
For most adults a BMI between 18.5 and 24.9 is considered healthy, though it is only one general indicator.
BMI does not distinguish muscle from fat, so very muscular people may read high. Treat it as a rough screening tool.
You can enter measurements in metric (kilograms and centimetres) or imperial (pounds, feet and inches).
No. This calculator is for general information only and is not a substitute for advice from a qualified healthcare professional.