Free Online BMI Calculator
Calculate your Body Mass Index (BMI) to assess if you're at a healthy weight. Enter your height and weight in metric or imperial units to see your BMI and category.
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Enter your weight and height to calculate BMI
Frequently Asked Questions
What formula does BMI use?
Metric BMI formula is weight (kg) divided by height (m)^2. Imperial uses 703 × weight (lb) / height (in)^2.
Is BMI a medical diagnosis?
No. BMI is a screening indicator and should be interpreted alongside other health factors such as body composition, waist circumference, and medical history.
What is considered a normal BMI?
For most adults, 18.5 to 24.9 is generally considered normal. Under 18.5 is underweight; 25–29.9 is overweight; 30 and above is obese. These thresholds may not apply to athletes or certain ethnic groups.