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.