BMI Calculator
Check your Body Mass Index in metric or imperial units, see your category, and get your healthy weight range.
What Is BMI?
Body Mass Index estimates body fat from your height and weight: BMI = weight (kg) ÷ height² (m²). It’s the screening measure used by the WHO and most health services. It doesn’t distinguish muscle from fat, so athletes can read “overweight” while lean — treat it as a starting point, not a diagnosis.
BMI Categories (WHO, adults)
- Below 18.5 — Underweight
- 18.5 – 24.9 — Normal weight
- 25.0 – 29.9 — Overweight
- 30.0 and above — Obese
Frequently Asked Questions
Is BMI accurate for everyone?
It’s a population-level screening tool. It can misread very muscular people, older adults and children (children use age-specific percentile charts instead).
What’s a healthy weight for my height?
Enter your height above — we show the weight range that corresponds to a BMI of 18.5–24.9.
Is my data stored?
No. The calculation runs entirely in your browser and nothing is sent to our servers.
This tool is for general information only and is not medical advice. Consult a healthcare professional about your individual situation.