The normal size of a healthy ovary is 3 cm long, 2.5 cm wide, and 1.5 cm thick, which is about 0.8cc to 12.7cc. The normal size of the right and left ovary can vary, but they are typically around the same size. The average normal ovary size ranges between 4 cc to 8 cc. However, individual variations and changes due to the menstrual cycle may occur.