Ovulation Date Calculator

A woman is fertile (able to become pregnant) only during a certain part of her monthly cycle—just before and during ovulation. By learning when you ovulate, you can predict when you’re likely to be fertile. This calculator provides approximate ovulation dates and fertile times for women who have regular periods. (Regular periods mean having a period every 21 to 40 days.) Fertility charting, basal temperature tracking, and purchased ovulation test kits can also be used to help predict a woman’s fertile times. These are especially useful if a woman has irregular periods.

Please note that the date you enter in the calculator may result in an ovulation date that has already passed. This will occur if you are nearing your next menstrual start date.

This calculator is not meant for women who are already pregnant. It cannot and should not be used as an aid to preventing pregnancy. This calculator is provided for educational purposes only and is not intended as a substitute for professional health care. Always consult with a health care provider for advice concerning your health.

Enter Your Information

What was the date of the first day of your last menstrual period?

References

Savitz D, et al. Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. American Journal of Obstetrics and Gynecology 2002 Dec. 187(6).

American Academy of Family Physicians. Natural Family Planning. 2001. Accessed at http://familydoctor.org/handouts/126.html

Nemours Foundation. Kids Health. Pregnancy Calender. 2003. Accessed on the World Wide Web at http://kidshealth.org/parent/pregnancy_calendar/pregnancy_calendar_intro.html

This calculator is not intended to replace the evaluation of a healthcare professional.

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