|X — first day of bleeding, which is the first day of your cycle|
|O — Possible time of ovulation|
|Day 1||Day 2||Day 3||Day 4||Day 5||Day 6||Day 7|
|Day 8||Day 9||Day 10||Day 11||Day 12||Day 13||Day 14|
|Day 15||Day 16||Day 17||Day 18||Day 19||Day 20||Day 21|
|Day 22||Day 23||Day 24||Day 25||Day 26||Day 27||Day 28|
|Day 29||Day 30||Day 31||Day 32|
Do you know your days of ovulation?
Use our free ovulation calendar above as a guide to help you track your ovulation. Some people also refer to this as an ovulation calculator.
When are you most fertile?
Our calculator can help you discover the most fertile days of your menstrual cycle or your “Estimated Fertility Window” based on the information you provide.
Find out a date for your next period and when you could possibly receive a positive pregnancy test.
Inexpensive, early detection pregnancy tests and ovulation test kits can be purchased online from our corporate sponsor Fairhaven Health.
Since it is so difficult to pin down exactly which day a woman ovulates, we give you a 10-day window of when ovulation is most likely to occur.
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 condom consistently and correctly.
How long do you ovulate?
For women who have a 28 to 32-day menstrual cycles, ovulation can take place between days 11 through 21, but it will only occur on ONE of these days. Remember, this is just an average of days that ovulation could take place—every woman’s cycle is different.
Ovulation itself only lasts for 12-24 hours; that is how long an egg is available for fertilization.