To determine body weight in pounds, the desired BMI is multiplied by 5 and then add BMI/5 lb for each inch >5 ft in height. For instance, for a BMI of 20, start with 100 lb for a height of 5 ft and add 4 lb for each additional inch of height. For a BMI of 25, start with 125 lb and add 5 lb for each inch of height.