Ovulation Calculator

This calculator is a free tool to help you track your ovulation day. Most women have 27-32 day cycles and ovulation can occur during days 11-21 of the menstrual cycle. These days represent average cycles; many women have a little bit shorter cycles and ovulate earlier and others have slightly longer monthly cycles with ovulation occurring later in the month.

For best results enter in the dates of the first day of your last three menstrual periods. If you can not recall these three dates, then enter in the first day of your last menstrual period.

Based on the average menstrual cycle of 28 days, your preceding menstrual period was on: (if this is not correct, and you know the date feel free to change the date calculated below)

For even more accurate calculation a preceding date is needed: (if this is not correct, and you know the date feel free to change the date calculated below)