Ovulation Calculator
Estimate your ovulation day, fertile window, and next period dates based on your menstrual cycle.
Estimated Ovulation Day
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Fertile Window
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Next Expected Period
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Best time to take a pregnancy test: --
DueDate if conceived: --
Upcoming Fertile Windows
About Ovulation & Fertility Tracking
The Ovulation Calculator estimates your most fertile days of the month by tracking your menstrual cycle dates.
How It Works
- Luteal Phase Estimate: Ovulation typically occurs roughly 14 days before the start of your next menstrual period.
- Fertile Window: Sperm can survive inside the female reproductive tract for up to 5 days, making the 5 days leading up to ovulation and the day of ovulation your prime conception window.
Note: This tool provides general calendar estimates and should not be used as a primary method of birth control.