Ovulation Calculator
Estimate your ovulation date and fertile window based on your menstrual cycle.
Understanding Ovulation
Ovulation typically occurs about 14 days before your next period (luteal phase). The fertile window spans approximately 5 days before ovulation and 1 day after. Sperm can survive up to 5 days in the reproductive tract, while the egg is viable for about 12-24 hours after release.
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About This Tool
The Ovulation Calculator helps women estimate their ovulation date and fertile window based on menstrual cycle length. Ideal for those planning to conceive.
Enter the first day of your last period, cycle length, and expected cycle regularity. The calculator provides an estimated ovulation date and fertility window over a month.
Use this tool to plan conception efforts or track menstrual cycles. All calculations are performed locally in your browser; no data is sent anywhere.