The normal size of the uterus should be 50mm x 40mm x 30mm, which is the size of the normal volume of the uterus. The size of the normal uterus is clinically 5cm, 4cm and 3cm in the anterior, posterior and transverse diameters. there is some individual variation in the size of the uterus. women of childbearing age who have a small uterine volume before childbirth may have an increased uterine volume after childbirth due to uterine rejuvenation. If there are uterine lesions, fibroids, adenomyosis or an increase in the size of the uterus, this is an abnormality.