Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It can be used to screen for weight categories that may lead to health problems, but it is not diagnostic of the body fatness or health of an individual.For Example, A BMI of 25 or more is overweight, while 30 or more is obese.
BMI is a simple and inexpensive screening tool that can be used to identify individuals who are at risk for weight-related health problems. It is also used to track changes in body weight over time.