Question: are all billiard balls the same size?
Answer: All standard pool balls have a diameter of 2 1/4″ and weigh roughly 6 ounces. Most c ue balls are the exact same. They have been the same weight and size for a long time. If they are different, then they probably have a diameter of 2 3/8″ and weight only a little more than 6 ounces.