Body mass index (BMI) is a measure that uses weight and height to estimate body fat. It is calculated by dividing a persons weight in pounds by the square of their height in inches, and multiplying the result by 703.
BMI is a useful tool for screening for weight-related health problems, such as obesity, overweight, and underweight. It can also be used to track changes in body weight over time. BMI was developed in the 19th century by Adolphe Quetelet, a Belgian mathematician and statistician.