Ovulation Calendar Do You Know When You Ovulate?

Our popular ovulation calculator will estimate your fertility window. This is the period of time during your monthly cycle when you can potentially conceive.

From first day of your period to the first day of your next period. Ranges from: 22 to 44. Default = 28 Optional: Leave 28 if unsure.
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When precisely are you most fertile?

If you are trying to conceive, APA suggests having intercourse every other day in this window. If you are trying to prevent pregnancy, avoid sex within this window and the 3-5 days before, or at least ensure you are using a form of birth control consistently and correctly.