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 Ovulation and Fertility Calculator

Following release of the egg from the ovary (ovulation), the human egg is capable of fertilization for only 12 to 24 hours. You are most likely to become pregnant if you have sex on the day of ovulation. However,  live sperm may still be present in your reproductive tract on the day of ovulation if you had sex for up to five days before ovulation. 

Last Menstrual Period:             (MM/DD/YYYY format)

Average Length of Cycles:      (22 to 45)

The number of days from the day you start your period to the day before 
your next period starts.

You can download a Fertility Chart to print OR as an Excel file at  Fertility Charting . to help you track your BBT and cervical mucus

If you are using an ovulation prediction kit, start testing 3 days before the expected  date of ovulation. If you have  irregular cycles, use the length of your shortest cycle in the past six months to estimate when to start testing your urine.

Keep in mind that  even if a woman's cycles are usually regular the timing of the fertile window  can be highly unpredictable, occurring  during a broad range of days in the menstrual cycle.   Couples wishing to have a baby can avoid the uncertainty of predicting fertile days by engaging in intercourse two or three times a week

SEE ALSO   How do I know if I'm ovulating?

Trying to conceive? Try these articles
Fertility Charting
Ovulation Kits

1. Allen J Wilcox, David Dunson, and Donna Day Baird. The timing of the "fertile window" in the menstrual cycle: day specific estimates from a prospective study BMJ 2000; 321: 1259-1262.PUBMED 11082086
2. Wilcox AJ, Weinberg CR, Baird DD.Timing of sexual intercourse in relation to ovulation. Effects on the probability of conception, survival of the pregnancy, and sex of the baby. N Engl J Med. 1995 Dec 7;333(23):1517-21.PUBMED 7477165

All calculations must be confirmed before use. The suggested results are not a substitute for clinical judgment. Neither OBFocus.com nor any other party involved in the preparation or publication of this site shall be liable for any special, consequential, or exemplary damages resulting in whole or part from any user's use of or reliance upon this material.

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