The National Institute of Health states that the Body Mass Index (BMI) is a measure of body fat based on height and weight for adult men and women. Acceptable Range; 18.5-24.9 Overweight 25.0-29.9 Obese 30.0-34.9 Severe Obesity 35.0-39.9 Morbid Obesity 40.0-49.9 Super-Morbid Obesity