Ovary size and volume

Last revised by Daniel J Bell on 3 May 2022

Ovary size and volume is frequently determined with ultrasound. The volume estimate is calculated by the formula for an ellipsoid, where D1, D2, and D3 are the three axial measurements:

D1 x D2 x D3 x 0.52

The normal, adult, non-pregnant, mean ovary volume of women who are not postmenopausal is 6-7 mL based on several studies which combined assessed tens of thousands of ovaries. 

20 mL had been proposed as a cut-off value between normal and abnormally large, but that value was subsequently shown to be inaccurate. Values two standard deviations above the mean (to help provide a threshold for enlargement):

  • 14-15 mL at <30 years of age
  • 13 mL in the 30s
  • 11 mL in the 40s
  • 5-6 mL in the 50s
  • 4-5 mL above 60 years of age

Ovary volume varies normally a bit by overall body size/height. Normal ovary volume during the fertile years may be as high as 24 mL and perhaps even higher.  The two ovaries may vary greatly in volume, side to side; it is not uncommon for one ovary to be twice the volume of the other.

There was no significant difference in ovary volume between studies done on a mixed U.S. population versus a cohort in Nigeria.

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