A normal-size uterus measures approximately 7 centimeters in length and 4 centimeters in width and thickness, states Dr. Gerard Dileo on Babble. The ovaries measure around 2 to 3 centimeters by 2 to 3 centimeters, notes Babble. After menopause, the ovaries decrease drastically in size.
The uterus can grow slightly in size after a woman gives birth, adds Dr. Dileo. Doctors use a pregnancy scale to describe the size of the uterus. For instance, if the uterus is enlarged to 12 centimeters, it can be described as being "10 weeks size," meaning it's the same size as in the 10th week of pregnancy.