Size after Puberty. The normal length is about 7.6 cm and width is 4.5 cm. The average normal thickness is 3.0 cm and in an adult female, the uterus weights about 60 grams but ranges up to 200 grams depending on various conditions.A variety of factors can result in enlargement of the uterus.he prepubertal uterus is about 3.5 cm in length and thickness is on average 1 cm. Hormonal stimulation that occurs during puberty will result in rapid growth and changes in the size of the uterus. The normal length is about 7.6 cm and width is 4.5 cm.