Ovulation Calculator
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Although there appears to be a wide variation ovulation usually occurs on day 14 of a 28 day cycle [1]. You can use the calculator below to estimate your date of ovulation.
 
1. Enter the number of days in your cycle
(28 days is average):

  days

2. Enter the first day of your last menstrual period.

Month: Day: Year:

3.

Date of ovulation is:

Most likely to conceive during the period:[2]

 

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.MEDLINE

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.MEDLINE  

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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