Body mass index (BMI) is a measure of body fat based on height and weight. It is calculated by dividing weight in kilograms (kg) by the square of height in meters (m). For example, a person who weighs 70 kg and is 1.75 m tall has a BMI of 22.86.
BMI is a widely used screening tool for malnutrition and obesity. It is also used to track changes in body composition over time. The World Health Organization (WHO) classifies BMI values as follows: