The rule of thumb for your DL is an eqaution that you can work out based on the measurement of your wingspan. What you want to do is stretch your arms out but not really reach for it just hold them up naturally at shoulder height. Then have someone measure from middle finger tip to middle finger tip. This is your wingspan. Now take this measurement and devide it by 2.5. This is a good estimate at your draw length. For instance my wingspan is 75'' / 2.5 = 30