Ovulation calculator

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Find out your ovulation day and most fertile days with this free ovulation calculator.

Description

This ovulation calculator allows you to calculate your most fertile days for your next menstrual cycles. It also shows the expected dates of ovulation and of beginning of the next periods.

The application is based on the idea that the fertile window is usually the six-day interval ending on the day of ovulation. The fertile window is the time in a cycle when pregnancy can occur. The ovulation, on the other hand, is expected to occur 14 days before next period. That means that intercourse is most likely to result in pregnancy if it occurs within the six-day interval ending the day of ovulation.

The chance of getting pregnant is shown for each fertile day, according to the study carried out by Allen J. Wilcox. This study was published on The New England Journal of Medicine on december the seventh, 1995 (N Engl J Med 1995; 333:1517-1521).

According to the American Society for Reproductive Medicine, the highest pregnancy rates are seen when a couple has intercourse every 1-2 days during the fertile window. The fertile window is the time in a cycle when pregnancy can occur and is usually the six-day interval ending on the day of ovulation.

Below is shown the probability of getting pregnant during your most fertile days:

  • Low fertility (10%): The probability of getting a pregnancy if you have sex on the fifth day before the ovulation date is 10%. From there, the probability of achieving a pregnancy increases progressively until the day of ovulation. The probability of achieving a pregnancy before the 5th day is practically 0%.
  • Medium Fertility (16%): The probability of getting a pregnancy if you have sex on the fourth day before the ovulation date is 16%.
  • Low fertility (14%): The probability of getting a pregnancy if you have sex on the third day before the ovulation date is 14%.
  • High fertility (27%): The probability of getting a pregnancy if you have sex on the 2nd day before ovulation is 27%.
  • High fertility (31%): The probability of getting a pregnancy if you have sex the day before ovulation is 31%.
  • Maximum fertility (33%): Estimated ovulation date. The probability of getting a pregnancy is 33% if you have sex on the day of ovulation.

Please, do not use this calculator as a tool to achieve or prevent pregnancy. This calculator cannot be considered professional or medical advice.

Not your language? consider the Spanish version of this ovulation calculator.

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