An adult body mass index (BMI) chart uses an individual's height and weight to calculate a BMI number, states the American Cancer Society. This number determines whether the individual is at a healthy weight, underweight, overweight or obese. A BMI less than 18.5 is considered underweight, a number between 18.5 and 24.9 is normal weight; anything between 25 and 29.9 is overweight and a number larger than 29.9 is obese.Continue Reading
Although BMI charts can be helpful in determining if an individual is at a healthy weight, they are not accurate in every situation. Athletes or those who participate in regular weight lifting may have a large amount of muscle mass that puts them in the overweight or obese category, even though they have a healthy body fat percentage.
Those with a small amount of muscle mass may fall into the healthy weight category, even when their body fat percentage is at an unhealthy level, notes the American Cancer Society.Learn more about Nutrition & Diets