Knowing when you ovulate is key to getting pregnant. Our Ovulation Calculator estimates your most fertile days by tracking your menstrual cycle. It provides a detailed calendar of your likely ovulation dates and fertile windows for the upcoming months.
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Ovulation Calculator
Calculate your most fertile days and predict your next ovulation.
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Your Cycle
Did you know? You are most fertile during the 5 days leading up to ovulation and the day of ovulation itself.
Ovulation Predictor
Enter your last period date to see your most fertile days for the next 3 cycles.
About Calculate Your Most Fertile Days
1
Last Period
Enter the first day of your last menstrual period (LMP).
2
Cycle Length
Input your average cycle length (days between periods).
3
View Calendar
See your predicted ovulation dates and fertile windows.
Key Features
3-Month Forecast
Predicts ovulation and fertile windows for your next 3 menstrual cycles.
Fertile Window
Highlights the 6-day period (5 days before + ovulation day) when conception is most likely.
Cycle Adjustments
Works for various cycle lengths, from short (21 days) to long (40 days).
Frequently Asked Questions
Ovulation typically occurs about 14 days before your NEXT period starts, regardless of cycle length.
Sperm can survive for up to 5 days inside the body, so your fertile window includes the 5 days before ovulation plus the day of ovulation itself.
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