To measure your height, stand straight and barefoot with your back against a wall. Your heels, back, shoulders and head should all be touching the wall. Pull in your chin and look straight ahead. Now, ask a second person to put a book on your head and slowly push it against the wall. Make sure the book is parallel with the floor and at right angles to the wall. Your helper should take a pencil and mark the spot where the bottom of the book is touching the wall. The distance from the marked spot to the floor is your height.