BMI Calculator
Your body mass index in two seconds, with the WHO ranges.
BMI compares weight with height. It is a quick screening number for adults, not a diagnosis: it does not know how much of your weight is muscle, so athletes often get a high BMI while being lean.
Formula: BMI = weight in kg ÷ (height in m)²
Results are estimates for general information, not medical or financial advice.
How it works
- Enter your values The result updates as you type.
- Switch units if needed Metric or US units, where it applies.
- Read the result Nothing is stored or sent anywhere.
FAQ
Is BMI accurate for athletes?
Not very. Muscle is heavier than fat, so strong or very fit people often land in the overweight range. The body fat calculator gives a better picture.
Is it free?
Yes. No account, no limits.
Is my data stored?
No. The calculation happens in your browser and nothing is sent to a server.