BMI Calculator

Body Mass Index (BMI) estimates body fat from your height and weight. It's a quick, widely used screening number.

The formula

• Metric: BMI = weight(kg) ÷ height(m)²
• Imperial: BMI = 703 × weight(lb) ÷ height(in)²

WHO categories (adults)

BMI	Category
below 18.5	Underweight
18.5 – 24.9	Normal
25 – 29.9	Overweight
30 and above	Obese

The tool also shows your healthy weight range — the weights that would put your BMI between 18.5 and 24.9 for your height.

Important

BMI is a general guide, not a medical diagnosis. It doesn't distinguish muscle from fat, so very muscular people can read as "overweight," and it isn't intended for children or pregnancy. For health decisions, talk to a professional.

Everything runs in your browser — your measurements are never uploaded.