BMI Calculator

Calculate your Body Mass Index (BMI) in metric or imperial units and see which weight category it falls into. Your data stays in your browser — nothing is sent anywhere.

How BMI is calculated

BMI = weight (kg) ÷ height (m)². It's a quick screening number that sorts adults into categories: underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (30+). BMI is a useful general indicator but doesn't distinguish muscle from fat, so athletes and some body types may read high without excess fat. Treat it as a starting point, not a diagnosis.

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Frequently asked questions

What is a healthy BMI range?

For most adults, a BMI between 18.5 and 24.9 is considered the healthy range. Below 18.5 is underweight; 25 and above is overweight.

Is BMI accurate for everyone?

It's a general screening tool, not a diagnosis. It can overestimate body fat in muscular people and underestimate it in others. Consult a professional for a full assessment.

Is my health data uploaded?

No. The calculation runs entirely in your browser; your height and weight are never sent or stored.