Body Mass Index (BMI)   BMI (Body Mass Index) is a popular method used to gauge whether or not a person is overweight. BMI is calculated by dividing a person's weight (in kilograms) by his or her height (in meters, squared). For example, my current weight is 104 kg and my height is 1.83m My BMI is 104 divided by 1.83 x 1.83 that is 104 divided by 3.35 = 31.04 which, unfortunately, makes me OBESE on the scale below    BMI Body Mass Index  Comment less than 18.5  Underweight 18.5 to 24.9  Ideal weight 25 - 29.9  Overweight 30 to 40  Obese 40 plus  Very Obese Please note: BMI is only a guide to overall health and must be looked at in conjunction with other factors