Free BMI Calculator
Calculate your Body Mass Index instantly. No account needed.
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Frequently Asked Questions
What is BMI? +
BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by height in meters squared. It's a simple screening tool, not a diagnostic measure.
What is a healthy BMI range? +
A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is classified as obese.
Is BMI accurate for everyone? +
BMI is a useful general indicator but has limitations. It doesn't distinguish between muscle and fat, so athletes may show a high BMI despite being healthy. Age, sex, and ethnicity can also affect the interpretation.
How is BMI calculated? +
BMI = weight (kg) / height (m) squared. For imperial units: BMI = (weight in pounds x 703) / (height in inches squared).
Is my health data stored? +
No. All calculations happen in your browser. Your height and weight are never sent to any server or stored anywhere.