How to use the BMI Calculator
- Choose metric or imperial units.
- Enter your weight and height.
- Read your BMI, category and healthy range.
BMI = weight (kg) ÷ height (m)². The WHO categories for adults are: under 18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight, 30 and above obesity.
BMI is a screening tool, not a diagnosis. It does not distinguish muscle from fat and is not designed for children, pregnant women or athletes.
Frequently asked questions
Is my information saved?
No. Calculations happen in your browser and nothing is stored or sent anywhere.
Is BMI accurate?
It is a useful population-level indicator, but individual health depends on more than BMI. Talk to a doctor for personal advice.