Nowadays, the Body Mass Index (BMI) is more commonly used to determine weight problems than the scale. The BMI is simply calculated by dividing the body weight in kg, with the total of height in meters by height in meters.
For instance my weight is 73 kg and my height is 1.83 m. I therefore divide 73 by 1.83 x 1.83 (3.3489) . The result is 21.79, which is in the “normal” range of 18.5 to 24.9. The BMI works well for people of a normal and overweight built.
However, very muscular individuals and athletes such as bodybuilders, powerlifters, sprinters and heavy weight boxers will have distorting results when calculating their BMI with the above formula, because their lean muscle mass exceeds the “normal” ranges. Measuring body fat percentage is more useful for them.
According to the BMI the weight categories are as follows:
BMI 18.5 – 24.9 = Normal
BMI 25.0 – 29.9 = Overweight
BMI 30.0 – 34.9 = Obese
BMI 35.0 – 39.9 = Severely Obese
BMI 40.0 and greater = Morbidly Obese