This tool estimates your peak fertility period, also known as your "fertile window." This is when you are most likely to get pregnant. Do not use this tool to prevent pregnancy.
In the tool, you will enter the typical length of your menstrual cycle, and you will click on the first day of your last menstrual period.
Fritz MA, Speroff L (2011). "Clinical Gynecologic Endocrinology and Infertility," 8th ed., Philadelphia: Lippincott Williams and Wilkins.
Your "fertile window" is up to 6 days long, once a month. It includes:
If you want to become pregnant, try to have sex every day or every other day from your first fertile day to your last fertile day.
If your periods are irregular, this calculator isn't a good way to predict your ovulation dates. Do not use this tool to prevent pregnancy.
Getting pregnant
Preventing pregnancy
Current as of: November 27, 2023
Author: Healthwise Staff Clinical Review Board All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
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Author: Healthwise Staff
Clinical Review Board All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
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