how do you size a bowling ball
1 Bowling ball sizes range from 6 (2.72kg) to 16 (7.26kg) pounds. 2  Pro bowlers often use a ball that is just under 10 percent of their body weight. 3  Try different size balls until you find the right size. 4  Begin with a smaller size and go up a pound until you find the highest weight can handle.. Test the size and angle of the finger holes in the ball. 1  Your fingers should fit properly and comfortably in the holes. 2  It is recommended that you have your bowling ball holes custom drilled in order to acquire a perfect fit.