BMI Calculator
Body mass index, metric or imperial.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Enter your height and weight — in metric (cm, kg) or imperial (ft/in, lb) — to get your BMI, the category it falls in, and the weight range considered healthy for your height. A quick screening number, computed entirely on your device.
Frequently asked questions
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². In imperial units it is 703 × weight (lb) ÷ height (in)². This tool does the unit conversion for you.
What do the categories mean?
The standard adult ranges are: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, and 30 or above obese.
Is BMI accurate for everyone?
BMI is a rough screening tool, not a diagnosis. It does not distinguish muscle from fat, so it can misclassify very muscular or older people. Treat it as one data point and consult a professional for health decisions.
Is my data stored?
No — it is calculated in your browser and never uploaded or saved.