Enter their height in feet and inches or in cm or meters. If doing this for your child or a child patient, enter their age and height. Finally, press "Predict Adult Height" to get the estimated adult height in centimeters and feet and inches from the height predictor. One of them is adding inches ( cm) to the average of the parent's height for a boy and subtracting inches ( cm) for a girl. The second calculator above is based on this method. Another simple method is to double the height achieved by the child by age 2 for a boy, or age 18 months for girl. How to get taller?
Jul 17, · Predicted heights are usually within 4 inches, taller or shorter, than actual adult height. Medical conditions and other factors can affect a child's growth.