For a 1.55-meter tall adult, the standard weight is approximately 50 kilograms; for a 1.55-meter tall child, the standard weight is determined according to his or her specific age, and is calculated using the formula: age of the individual x 2 + 8. There are various formulas for calculating the standard weight of adults, one of the more commonly used is: standard weight (kg) = height (cm) – 105. If a person is 1.55 meters tall, i.e., 155 centimeters, his or her standard weight is 50 kilograms. Adults with a height of 1.55 meters have a normal weight range of 10% above and below the standard weight, i.e., 45 to 55 kg can be called normal weight. Normal body weight is used to determine whether an individual is thin, overweight or obese. If an individual’s weight is less than 10% of the standard body weight as lean, more than 10% of the standard body weight as overweight, more than 20% of the standard body weight as mildly obese, more than 30% of the standard body weight as moderately obese, and more than 50% of the standard body weight as severely obese. If an individual’s weight is too much above or below the standard weight, he or she should go to the hospital for an examination to find out whether the weight is abnormal due to disease or other reasons, so that targeted treatment can be carried out as early as possible.