BMI Calculator
Body Mass Index and weight category — metric or imperial.
About BMI Calculator
A BMI calculator estimates body fat from your height and weight and places you in a category — underweight, normal, overweight, or obese. Enter your measurements in metric or imperial units and get your Body Mass Index and category instantly.
Frequently asked questions
- How is BMI calculated?
- BMI is weight in kilograms divided by height in metres squared (kg/m²). The tool converts imperial units for you.
- What are the BMI categories?
- Under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese, per WHO ranges for adults.
- Is BMI accurate for everyone?
- BMI is a general screen and doesn't distinguish muscle from fat, so it can misclassify athletes. Treat it as a rough guide, not a diagnosis.
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