Ovulation Calculator

This tool estimates your upcoming fertile days to help you on your conception journey.

1. First Day of Last Period:

Select the exact date your last menstrual period began.

2. Average Cycle Length:

Enter the average number of days in your menstrual cycle. This is the time from the first day of one period to the day before the next one starts. The average is 28 days, but it can range from 21 to 35 days.

3. Calculate:

The calculator will show your estimated fertile window, ovulation day, and your next period's start date. It also provides an estimated due date if you conceive during this cycle.