BMI is a ratio of weight to height. It is calculated by dividing a person's weight in kilograms by the square of their height in meters. The resulting number is used to categorize individuals into different BMI ranges, such as underweight, normal weight, overweight, and obese. It is commonly used as a screening tool to assess whether a person has a healthy body weight relative to their height. However, it does not directly measure body fat or differentiate between fat and muscle mass, making it an imperfect measure of overall health.
