This chart is an essential tool for primary care professionals and anyone involved in wellness and weight counseling. With this tool, it is easy to find the patient's Body Mass Index (BMI) score based on their height and weight and to discover if the patient has a high-risk waist line. This chart provides: A definition of BMI. English and Metric formulas for BMI. Limitations of BMI. Table of classifications of BMI scores, from Underweight to Extreme Obesity. Information and direction to discover if a patient has a high-risk waist circumference. The Waist Circumference measure is useful in assessing risk for adults who are normal or overweight according to the BMI table. Size is 20" W by 26" H.