With a height of 170cm and a weight of 120 pounds, the calculated body mass index, or BMI, is 20.76, which is within the normal range of BMI for adults, so it is a normal situation. BMI is an important indicator used to determine whether a person is obese and whether his or her body shape is normal, and the normal range of BMI for adults is between 18.5 and 23.9, and as long as the BMI is within this range, it means There is no obvious wasting or overweight, or even obesity. So a height of 170cm and a weight of 120 pounds is normal. the calculation of BMI is obtained by dividing the kilograms of weight by the square of the meters of height. the calculation of BMI is not applicable to old and frail people or infants, children and adolescents, but only to normal adults.