Calculate your Body Mass Index (BMI) in seconds — metric or imperial units.
This free BMI (Body Mass Index) calculator works with both metric (kg/cm) and imperial (lb/in) units, giving you an instant result and telling you which weight category — underweight, normal weight, overweight, or obese — you fall into, based on World Health Organization (WHO) standard BMI ranges.
BMI is one of the most widely used quick health screening numbers, though it doesn't account for muscle mass or body composition, so it should be used as a general guide rather than a full medical assessment. As always, everything is calculated locally in your browser — nothing you enter is stored or transmitted.
Body Mass Index (BMI) is a simple calculation using your height and weight that estimates whether you're in a healthy weight range. It's calculated as weight (kg) divided by height (m) squared.
BMI is a useful general screening tool but doesn't account for muscle mass, bone density, or body composition. Athletes and very muscular people may show a higher BMI despite being healthy. Consult a doctor for a full health assessment.
A BMI between 18.5 and 24.9 is generally considered a healthy weight range for most adults, according to WHO guidelines.
No — everything is calculated locally in your browser. Nothing is sent to or stored on any server.