Calculate your Body Mass Index (BMI) in seconds. Enter your height and weight — in metric or imperial units — and instantly see your BMI, which weight category you fall into, and the healthy weight range for your height.
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–BMI is a screening measure, not a diagnosis — muscle mass, age, and body composition also matter. Talk to a professional for health advice.
How to use the BMI Calculator
- Choose Metric or Imperial units.
- Enter your height and weight.
- Click Calculate BMI to see your score, category, and healthy weight range.
Frequently asked questions
What is BMI?
Body Mass Index estimates body fat from height and weight: weight divided by height squared. It is the standard screening measure used worldwide.
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered the healthy range for most adults. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
Not always — athletes with high muscle mass, older adults, and children need different assessments. Treat BMI as a starting point, not a diagnosis.