Calculate your body-mass index (BMI) to measures height/weight ratio (weight in kilograms divided by the square of your height in meters). For instance, if your height is 1.82 meters, the divisor of the calculation will be (1.82 * 1.82) = 3.3124. If you weigh 70.5 kilograms, then your BMI is 21.3 (70.5 / 3.3124). People with BMIs between 19 and 22 live longest. Death rates are noticeably higher for people with indexes 25 and above. This is the American version of the calculation. Enter your height (in feet and inches) and weight (in pounds) in the boxes below, and then click "calculate". These are converted to metric values to figure your BMI. If you're not American, click here for a version of this page that accepts metric values. Note: your browser must support Javascript, or this will not work. Also note: if you are exactly 5 feet or 6 feet tall, put a 0 in the inches box. The result is "infinity" if you leave the inches box empty.