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Ovulation Date Calculator

A woman is able to become pregnant (fertile) only during a certain part of her monthly cycle. That is just before and during ovulation. By learning when you ovulate, you can predict when you’re likely to be fertile. This calculator gives approximate ovulation dates and fertile times for women who have regular periods. (Regular periods mean having a period every 21 to 35 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. It is not intended as a substitute for professional health care. Always consult with a healthcare provider for advice concerning your health.

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

Medical Reviewers:

  • Burd, Irina, MD, PhD
  • Freeborn, Donna, PhD, CNM, FNP
  • Trevino, Heather, RN