Body Mass Index (BMI) is a measure of body fat based on height and weight. It is used to screen for weight-related health problems such as obesity, underweight, and eating disorders.
BMI is calculated by dividing weight in kilograms by the square of height in meters. The resulting number is then compared to a chart to determine the person’s BMI category. BMI is a simple and inexpensive way to screen for weight-related health problems, but it is not a perfect measure of body fat.