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Ovulation, Fertile Window & Period Calculator
Calculate your estimated ovulation date, peak fertile window, and next menstrual cycle based on your last period.
Parameters
Configure the inputs for precise results.
Awaiting Parameters
Fill in the tool settings and click calculate to see the magic happen.
How to Use
1
Select Last Period Date
Enter the first day of your last menstrual period.
2
Specify Cycle Length
Enter the average number of days in your menstrual cycle.
3
View Fertile Window & Ovulation
See your peak fertility days, ovulation date, and earliest pregnancy test timing.
FAQ
How is ovulation date calculated?
Ovulation typically occurs 14 days prior to the start of the next menstrual period in a standard 28-day cycle.
What is the fertile window?
The fertile window includes the 5 days leading up to ovulation plus the day of ovulation itself, as sperm can survive up to 5 days in the reproductive tract.