Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It is calculated by dividing the weight in kilograms by the square of the height in meters. For example, a person who weighs 70 kilograms and is 1.75 meters tall has a BMI of 22.86.
BMI is a useful tool for screening for weight-related health problems. It is inexpensive and easy to calculate. BMI can also be used to track weight loss or gain over time.