To determine the length of your
best recurve bow, multiply your draw length by 40 inches. It is the length of the bowstring at the point where it encounters the draw weight of the bow. That's where accuracy and force are maximized. You can calculate it by measuring the length of your arm and dividing it by. In addition to adult sizes, many bows come in youth sizes, which are shorter in length. Measure each child just like you would an adult. Youth sizes usually don't exceed 54 inches.