Antral Follicle Count Calculator

How it is calculated

The tool adds the two counts you read from the ultrasound report: total AFC = left ovary + right ovary. It then places the total in a band using fixed cut-offs: under 7 is Low, 7 to 20 inclusive is Normal, and above 20 is High (possible PCOS). Both counts must be whole numbers of zero or more; a decimal or negative entry gives no result. The bands are one simple scheme built into the tool. Laboratories and clinics use different thresholds depending on age and method, so a category here is a rough orientation, not a diagnosis, and it says nothing about AMH, age or cycle regularity. The result is not medical advice.

Common mistakes

• Entering the total in one box and zero in the other. It still sums correctly but you lose the left and right split; enter each ovary separately.
• Typing the follicle size in millimetres instead of the count, or a range such as 5-8. Only whole numbers are accepted.
• Treating the band as a diagnosis. The 7 and 20 cut-offs here are the tool's own, and a report or clinic may define low and high differently.
• Comparing counts from different cycle days or different scans as one figure; one count reflects one scan.
• Reading "High" as confirmation of PCOS. A high count is one sign among several and needs a clinician's assessment.