What is the normal size of the uterus?

The uterus is the organ responsible for embryo and fetal development as well as menstruation. It is pear-shaped and oriented upside-down. So, what is the normal size range of the uterus?

Normal Uterine Size Range

Normal uterine size range: Typically weighs approximately 55–75 g; measures about 6–9 cm in length, 5–6 cm in width, and 3–4 cm in thickness; and has a capacity of approximately 5 mL. The uterus is generally divided into two parts: the uterine body (corpus) and the cervix. The uterine body is broader and occupies the upper portion of the uterus. Its dome-shaped top is termed the uterine fundus, while the regions where the fundus meets the fallopian tubes on either side are called the uterine horns (cornua). The ratio of uterine body to cervix varies with age and ovarian function: it is approximately 1:2 during puberty, 1:1 during the reproductive years, and 2:1 after menopause.

In pregnant women, polycystic-appearing ovaries and polycystic ovary syndrome (PCOS) may occur. Polycystic-appearing ovaries refer to bilateral ovaries containing numerous small follicles; specifically, the presence of more than 13 follicles measuring less than 1 cm in diameter on one side qualifies as polycystic-appearing ovarian morphology. In contrast, PCOS is an endocrine disorder characterized by chronic anovulation and hyperandrogenism. While polycystic-appearing ovaries may be one feature of PCOS, not all cases of PCOS exhibit this morphology, nor does every instance of polycystic-appearing ovaries indicate PCOS.

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