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Enter your ultrasound follicle measurements to instantly assess development and optimize your chances of conceiving.
Arithmetic mean of three positive ultrasound diameters in mm. Maturity/growth/ovulation classifications were removed; the mean alone cannot determine treatment timing.
Please enter three diameter values to calculate the average
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This calculator takes three positive follicle diameter measurements in millimeters and returns their arithmetic mean, shown to one decimal place. Use measurements that refer to the same follicle and the same ultrasound examination. The calculation is a compact way to summarize numbers already recorded in a report; it does not analyze an ultrasound image or choose which follicle to measure.
For example, 20, 22, and 19 mm produce (20 + 22 + 19) ÷ 3 = 20.333…, displayed as 20.3 mm. The displayed rounding does not add clinical interpretation.
The page requires all three entries to be positive numbers before it shows a result. It does not determine whether three measurements are the right set for your examination, and it does not classify the result as small, growing, or mature. In its focused reproductive endocrinology and infertility examination parameter, AIUM describes recording the mean from at least two perpendicular dimensions for certain follicle monitoring. Follow the method and measurements in your report or care team's instructions; do not add or repeat a value just to fill a field.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Confirm that the three values belong to one follicle from one examination and are stated in millimeters. Keep the report's date and follicle identifier with your notes.
Enter the numbers only, one per field. If the report uses centimeters, convert each measurement to millimeters first: 1 cm equals 10 mm. Do not mix measurements from different follicles or visit dates.
The mean appears once all three values are valid positive numbers. It is rounded to one decimal place and can be copied. Use Reset to clear the entries before starting another set.
If your report gives only one or two dimensions, retain those reported values and ask the clinician or imaging service how they want them summarized. This calculator will not fill in missing measurements.
Use cases
See how the tool fits into real work and everyday tasks.
When a report already lists three dimensions for one follicle, calculate their mean and keep it beside the original values, examination date, and report wording. The mean can make the set easier to review without replacing the report.
For repeated examinations, calculate each eligible set separately and label it with its date and follicle identifier. The calculator does not compare visits or estimate growth, so retain the source measurements for any clinical review.
Q&A
Find concise answers to common questions and confusing cases.
Not with this page: all three fields must contain positive numbers. Do not copy one measurement into another field to get a result. Keep the values as reported and ask the clinician or imaging service which summary is appropriate.
No. The result is only the arithmetic mean of the three numbers entered. It does not assess maturity, predict ovulation, estimate fertility, or recommend treatment.
Measurement and reporting methods depend on the examination context. For example, the cited AIUM parameter describes at least two perpendicular dimensions and a recorded mean in a particular monitoring context. This page has a fixed three-field input; follow the report and your care team's instructions rather than treating that interface rule as a medical standard.
Notes
Review scope, result limitations, and important precautions before use.
This result is not a diagnosis, an assessment of egg or follicle maturity, an ovulation prediction, a fertility estimate, or treatment advice. The page does not validate whether measurements came from the same follicle, scan, or measurement convention. For interpretation or care decisions, use the original ultrasound report and consult a qualified healthcare professional.
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