BMI Calculator
Find your Body Mass Index and the standard weight category — private, in your browser.
BMI is a general screening tool. It does not account for muscle, build, age or other factors, and is not a diagnosis or a measure of health on its own. For advice about your weight or health, please speak with a qualified healthcare professional.
Body Mass Index (BMI) is a quick way to see where your weight falls relative to your height. Enter your details in metric or imperial units and the calculator shows your BMI and the standard World Health Organization category, with a scale to see exactly where you sit.
How to use
- Choose metric or imperial units.
- Enter your weight and height.
- Read your BMI and category on the scale.
Frequently asked questions
How is BMI calculated?
BMI is your weight in kilograms divided by your height in metres squared. The imperial version uses pounds and inches with a 703 factor.
What are the BMI categories?
Under 18.5 is underweight, 18.5 to 24.9 is normal, 25 to 29.9 is overweight, and 30 or above is obesity, per the World Health Organization.
Is BMI a complete measure of health?
No. BMI is a general screening tool and does not account for muscle, build or other factors. For personal advice, speak with a healthcare professional.
Is my data private?
Yes — the calculation runs in your browser and nothing is sent anywhere.