The standard weight for a 168cm girl is around 53-69kg. Internationally, the BMI index is commonly used as a standard to determine normal, overweight, obesity, too light and whether the health of a standard, the formula for the BMI = weight (kg) divided by the square of the height (meters), the unit is (kg/m2). The unit is (kg/m2). BMI between 18.5 and 24.9kg/m2 is considered normal, less than 18.5kg/m2 is considered too light, more than 25kg/m2 is considered overweight, and more than 30kg/m2 is considered obese. Therefore, knowing the height of a girl and the normal range of BMI, the standard weight of a girl can be calculated according to the formula to be around 53-69kg. BMI can be used as a reference standard when judging whether weight is healthy or not based on height. Human body weight is one of the signs reflecting a person’s health status, too fat, too thin are not conducive to human health.