BMI Calculator
Body Mass Index from your height and weight โ metric or imperial.
Your BMI-
Category-
Healthy weight range-
How BMI is calculated
BMI is weight in kilograms divided by height in meters squared (kg/mยฒ). The World Health Organization classifies results as: under 18.5 underweight, 18.5โ24.9 normal, 25โ29.9 overweight, and 30+ obese.
Limitations worth knowing
BMI is a population-level screening measure, not a diagnosis. It doesn't distinguish muscle from fat โ athletes often score "overweight" with low body fat โ and it doesn't account for age, sex or fat distribution. Treat it as a rough signal and talk to a doctor about what it means for you specifically.
Frequently asked questions
Is my health data stored?
No. The calculation runs in your browser; height and weight are never transmitted or saved.