Body Mass Index (BMI) is a measure of a person's weight in relation to height, not body composition.

BMI values apply to both men and women, regardless of age or frame size. Use this information, along with other health indices, to assess your need to adjust your weight.

A BMI score between 20 and 25 is considered ideal. A score below 18.5 indicates underweight while a score between 25 and 29 indicates overweight. Experts consider a score of 30 or higher an indicator of obesity. These values do not apply to athletes and body builders, pregnant and nursing women, the frail or elderly or people under 18.