Your BMI result will be displayed as a number with one of these weight categories: underweight. a healthy weight. Overweight. obese. After you get your result, you may be asked to measure your waist measurement. This can help you understand if you are carrying too much weight around your stomach. How your BMI is calculated. Connect with nutrition, physical activity and obesity. Last revised: Division of Nutrition, Physical Activity and Obesity National Center for Chronic Disease Prevention and Health Promotion. This calculator provides BMI and the corresponding BMI weight status category. Use this calculator for older adults. Based on BMI measurements, the CDC considers a BMI or higher to be obese. 1 Obesity is further subdivided into three categories: 35: -40.