Ever wonder if you are at a healthy weight? Enter your height and weight in our advanced Body Mass Index (BMI) calculator. This tool provides you with two important numbers reflecting the estimated impact of your present bodyweight and shape upon your overall health. BMI is the most widely-used diagnostic tool to identify weight problems. In addition, Knee1's unique Advanced BMI system looks at other critical measurements ignored by other systems. Specifically these include: waist and hip sizes and waist/hip ratios.