BMI Calculator

Body Mass Index (BMI) is weight in kilograms divided by the square of height in metres. It is used as a simple screening tool for weight categories (underweight, normal, overweight, obese).

For adults, 18.5–24.9 is generally considered normal. Below 18.5 is underweight, 25–29.9 overweight, and 30 or above obese. These are general guidelines, not a diagnosis.

Adult BMI ranges are not used for children. Paediatric growth charts and BMI-for-age are used instead. This calculator is for adults only.

BMI does not distinguish muscle from fat, so athletes may have a high BMI but be fit. It also does not account for age, gender, or body frame. Use it as one indicator; a doctor can give a full assessment.