Body mass index is an internationally standardized obesity typing standard recommended by the World Health Organization, and can be used as a simple test to determine whether your weight is within the normal range. However, there is a small disadvantage that it does not reflect the distribution of localized body fat. In other words, even if your weight is within the normal range, there may be a local fat accumulation problem yo. The calculation is: Body mass index = weight (kg) / height 2 (m 2). Example: For example, if you weigh 60 kg and are 1.67 meters tall, your body mass index is 21.5, which is within the normal range and you are not overweight.