Body mass index (BMI) is a measure that uses height and weight to estimate body fat. It is calculated in pounds by dividing weight in pounds by the square of height in inches, and then multiplying the result by 703.
BMI is used to assess health risks associated with overweight and obesity. It is also used to track weight loss progress. The history of BMI can be traced back to the 19th century, when it was first developed by Adolphe Quetelet, a Belgian mathematician and astronomer.