- Extend your arm in front of your body bending your elbow at a ninety degree angle to your body so that your forearm is parallel to your body.
- Keep your fingers straight and turn the inside of your wrist towards your body.
- Place your thumb and index finger on the two prominent bones on either side of your elbow, then measure the distance between the bones with a tape measure or calipers.
The chart lists elbow measurements for a medium frame - if your elbow measurement for that particular height is less than the number of inches listed, you are a small frame - if your elbow measurement for that particular height is more than the number of inches listed, your are a large frame.