Try our free online Ovulation Calculator!

Use the Ovulation Calculator to:

  • Find out when your ovulation date is
  • Increase (or decrease) the likelihood of getting pregnant by calculating when your most fertile days are (keep in mind that you are most fertile on your ovulation date)

How to use the Ovulation Calculator

Enter the date of your last menstrual period and the number of days in your menstrual cycle into the pregnancy calculator, and click on the Calculate button.

On average, there are 28 days in a menstrual cycle, but it can last from as little as 22 to as many as 44 days. The Ovulation Calculator gives you the approximate ovulation date, but if your menstrual cycle is irregular the results may be less accurate.

Ovulation Calculator

When was the first day of your last menstrual period?

Number of days in your menstrual cycle
Your ovulation date (mm/dd/yyyy) is:
Your fertile days are:
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Got Pregnancy Questions?

Thanks for trying out our Ovulation Fertility Calculator! If you have any type of pregnancy related questions, please visit where you can try the online virtual pregnancy test, give the Chinese boy/girl gender predictor a spin and browse through our active pregnancy question & answer blog.