Ovulation Calculator

Trying for a baby is one of the most exciting times in your life.  While conception is a very natural process, you might be interested to know that there are only a few days each menstrual cycle when conception is actually possible!  These most fertile days occur when your body is undergoing ovulation – the release of one of your eggs (or two if you have fraternal twins) from your ovaries.  So becoming pregnant may simply be a matter of good timing to begin with and our Ovulation calculator may help you get this timing right. The length of your menstrual cycle can vary from month to month so it’s important to track your cycle.  To use this ovulation calculator, you need to be able to provide three pieces of information:

  1. When was the first day of your last menstrual cycle?
    this is the day your last period stopped.
  2. How many days in your menstrual cycle
    measured from the first day of your cycle to the first day of your next cycle.
  3. The number of days in your luteal phase
    This is the latter phase of your menstrual cycle starting from ovulation and ending on the first day of your next cycle.  While the amount of time before ovulation can vary widely each month, the time after ovulation to the end of your cycle is usually fairly constant and unless you have a health problem that affects your periods or you become pregnant, this phase will be 14 to 16 days. If you are not sure about the length of your luteal phase, you can assume it is 14 days (the average length for most women).

Calculate your ovulation dates

When was the first day of your last menstrual cycle?
How many days in your menstrual cycle?
How many days in your luteal phase?



The methods used by this application are based on an estimation taking into account information provided by the user and scientific knowledge/understanding in this area. The use of this application is at the entire discretion of the user and does not replace any formal advice from your doctor or healthcare provider. The user assumes any risk associated with using this application.