How to read this calculator
Enter the measurements, or press Simulate to load a case from the reviewed validation catalog. The calculator then shows:
- Results: Ovarian volume and PCOM ovarian-volume criterion (≥10 mL).
- Pavlik comparison: Pavlik comparison not applied
Decision steps: premenopausal / postmenopausal, ages 25–91
| Step | Criterion | Meaning | Detail |
|---|---|---|---|
| OV0 | Patient group unknown or outside ages 25–91 | Pavlik comparison not applied | Pavlik studied women aged 25–91 undergoing transvaginal ultrasound in an ovarian cancer screening programme. This comparison is not applied outside that age range or without menopausal status. |
| OV1 | Eligible premenopausal V≤20; eligible postmenopausal V≤10 | Does not exceed the published limit | This volume does not exceed Pavlik’s published upper limit. This is not an age-specific percentile or evidence that the ovary is disease-free. |
| OV3 | Eligible premenopausal V>20; eligible postmenopausal V>10 | Exceeds the published limit | This volume exceeds Pavlik’s published upper limit. Volume alone does not establish the cause or determine follow-up. |
Reference values
In the University of Kentucky Ovarian Cancer Screening Program (Pavlik et al., 2000), 58,673 transvaginal ultrasound measurements in 13,963 women aged 25–91 years were analyzed using the prolate ellipsoid formula (L × H × W × 0.523); this calculator uses π/6 ≈ 0.5236.
| <30 years | 6.6 cm³ |
|---|---|
| 30–39 | 6.1 |
| 40–49 | 4.8 |
| 50–59 | 2.6 |
| 60–69 | 2.1 |
| ≥70 | 1.8 |
The screening programme enrolled women aged 50 or older, and women aged 25 or older with a family history of ovarian cancer (van Nagell 2000).
Mean ovarian volume was 4.9 cm³ in premenopausal women and 2.2 cm³ in postmenopausal women. The authors reported an upper limit of normal of 20 cm³ in premenopausal women and 10 cm³ in postmenopausal women.
Use of exogenous estrogens was associated with smaller ovarian volume in women aged 40–59 years, but not in women 60 or older.
In an earlier ultrasound study of 1,157 ovaries in 725 patients (Cohen et al., Radiology 1990), average ovarian volumes were 9.8 cm³ in menstruating, 5.8 cm³ in postmenopausal, and 3.0 cm³ in premenarchal patients, with no significant difference between right and left ovaries.
Kelsey et al.’s pooled normative model predicted an average ovarian volume of 0.7 mL at age 2, a peak of 7.7 mL at age 20, and about 2.8 mL around menopause. These modeled age-related values are not the fixed Pavlik upper limits used here.
Polycystic ovarian morphology
In adults, the 2023 international guideline identifies follicle number per ovary as the most effective ultrasound marker for polycystic ovarian morphology (PCOM), using ≥20 follicles in at least one ovary. When older technology or inadequate image quality prevents reliable whole-ovary follicle counting, ovarian volume ≥10 mL or follicle number per section ≥10 in at least one ovary may be used. For transabdominal ultrasound, the guideline primarily reports ovarian volume or follicle number per section because whole-ovary follicle counting is difficult.
Ultrasound PCOM criteria are not recommended in adolescents. The guideline discusses reassessment at or before full reproductive maturity, eight years after menarche; age 18 alone does not establish that maturity.
The reporting recommendations list ovarian cysts, corpora lutea and dominant follicles ≥10 mm among features excluded from ovarian-volume calculations. Where a dominant follicle is present, the guideline relies on the contralateral ovary’s follicle count. This calculator conservatively withholds its PCOM volume assessment when these features or other volume-distorting pathology are present; it does not subtract estimated lesion volumes.
The syndrome was renamed polyendocrine metabolic ovarian syndrome (PMOS), formerly PCOS, in 2026; the diagnostic criteria remain unchanged. The current official recommendations retain the term PCOM. Diagnosis requires two of hyperandrogenism, ovulatory dysfunction, and PCOM, with exclusion of other causes; in adults, AMH may be used instead of ultrasound to define PCOM. When irregular menstrual cycles and hyperandrogenism are present, ultrasound is not necessary for diagnosis.
Worked example
In Mehta et al.’s report, a 64-year-old postmenopausal woman’s left ovary measured 2.8 × 2.3 × 2.9 cm on transvaginal ultrasound. Using π/6 gives 9.78 mL, which does not exceed Pavlik’s published 10 mL limit. Bilateral Leydig cell hyperplasia was nevertheless found on pathology: a within-limit volume does not exclude ovarian disease.
| Item | Value |
|---|---|
| Length (longitudinal) | 2.8 cm |
| Width (transverse) | 2.3 cm |
| Depth (AP) | 2.9 cm |
| Ovarian volume | 9.78 mL |
| PCOM ovarian-volume criterion (≥10 mL) | Not applied |
Volume alone does not exclude ovarian disease or diagnose PMOS (formerly PCOS). Polycystic ovarian morphology
O-RADS
O-RADS US v2022 classifies ovarian/adnexal findings using lesion descriptors and size; its assessment-category tables do not provide a whole-ovary volume cutoff. This calculator does not assign an O-RADS category.
Frequently asked questions
How is ovarian volume calculated?
Ovarian volume is usually estimated with the ellipsoid formula: length × width × height × 0.5236 (π/6). For example, 3.0 × 2.0 × 1.5 cm gives about 4.71 mL.
What is the upper limit of normal ovarian volume?
In 13,963 women aged 25–91 in an ovarian cancer screening programme, Pavlik et al. reported an upper limit of normal of 20 cm³ in premenopausal women and 10 cm³ in postmenopausal women. These are fixed published limits, not age-specific percentiles, and a volume below them does not exclude ovarian disease.
What ovarian volume is used for polycystic ovarian morphology?
When older technology or inadequate image quality prevents reliable whole-ovary follicle counting, ovarian volume ≥10 mL or follicle number per section ≥10 in at least one ovary may be used. Polycystic ovarian morphology
How is ovarian volume measured on ultrasound?
Measure one whole ovary in three dimensions on two orthogonal planes. Enter ovarian dimensions, not dimensions of a separate adnexal mass. For PCOM assessment, the 2023 international guideline’s reporting recommendations list ovarian cysts, corpora lutea and dominant follicles ≥10 mm among features excluded from ovarian-volume calculations.
References
- Pavlik EJ, DePriest PD, Gallion HH, et al. Ovarian volume related to age. Gynecol Oncol. 2000;77(3):410-412. doi:10.1006/gyno.2000.5783. PMID 10831351.
- Cohen HL, Tice HM, Mandel FS. Ovarian volumes measured by US: bigger than we think. Radiology. 1990;177(1):189-192. doi:10.1148/radiology.177.1.2204964. PMID 2204964.
- Teede HJ, Tay CT, Laven J, Dokras A, et al. Recommendations from the 2023 international evidence-based guideline for the assessment and management of polycystic ovary syndrome. Hum Reprod. 2023;38(9):1655-1679. doi:10.1093/humrep/dead156. PMID 37580037. PMC10477934.
- van Nagell et al. Gynecol Oncol 2000;77:350–356. doi:10.1006/gyno.2000.5816. PMID 10831341.
- Kelsey et al. Ovarian volume throughout life: a validated normative model. PLoS One 2013;8:e71465. doi:10.1371/journal.pone.0071465. PMID 24019863.
- AIUM Practice Parameter for the Performance of an Ultrasound Examination of the Female Pelvis, 2024 Revision. doi:10.1002/jum.16556.
- Teede et al. Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. Lancet 2026;407:2329–2339. doi:10.1016/S0140-6736(26)00717-8. PMID 42119588.
- Bahri-Khomami et al. From polycystic ovary syndrome to polyendocrine metabolic ovarian syndrome: what obstetricians and gynecologists need to know. Am J Obstet Gynecol 2026;235:999–1002. doi:10.1016/j.ajog.2026.08.024. PMID 42665241.
- Official terminology-updated recommendations: https://www.asrm.org/practice-guidance/practice-committee-documents/recommendations-from-the-2023-international-evidence-based-guideline-for-the-assessment-and-management-of-polyendocrine-metabolic-ovarian-syndrome-2023
- ACR O-RADS US v2022 Assessment Categories: https://www.acr.org/-/media/ACR/Files/RADS/O-RADS/US-v2022/O-RADS--US-v2022-Assessment-Categories.pdf
- Mehta et al. Ovarian Leydig Cell Hyperplasia: An Unusual Case of Virilization in a Postmenopausal Woman. Case Rep Endocrinol 2014;2014:762745. doi:10.1155/2014/762745. PMID 25045549.