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Ovulation Calculator

Enter the first day of your last period and your cycle length; we estimate your ovulation day, your most fertile window and your next period date.

These results are estimates; they vary with irregular cycles and should not be used as a method of contraception.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator estimates the days in a menstrual cycle when conception is most likely, working backward from the typical length of the luteal phase, which tends to be more consistent than the first half of the cycle, and using the cycle length a person enters as the main input. The result is a fertile window rather than a single guaranteed day, since ovulation timing can shift from cycle to cycle.

It is used by people trying to conceive who want to time intercourse around the most fertile days, as well as by people tracking their cycle for general awareness or to anticipate symptoms. Because it relies on average patterns, it tends to work best for those with fairly regular cycles.

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