How do I use an Ovulation Calculator?


An Ovulation Calculator is also known as an Ovulation Calender.  An Ovulation Calculator is typically used when you are trying to get pregnant.


The Ovulation Calculator indicates the days in your cycle when you are most fertile, and also your safe days.  So you can use this calculator to know what day during your cycle you are most fertile, and if you are using the safe days method, it also indicates what days in your cycle are safe for you to enjoy intimacy, without the likelihood of conceiving.


The Ovulation Calculator is particularly useful if you have a regular cycle.  A regular cycle means that your monthly period starts after the same number of days, each month.  For a majority of women, their cycle is usually 28 days.  For others, it’s as short as 21 days, while for others, it can be as long as 35 days, or even longer.


If your cycle is not regular, then it would be beneficial to either consider using supplements that help to regulate the cycle, or if you’re trying to conceive, using the ovulation predictor kits to check when you are fertile/ovulating.


The Ovulation Calculator also helps you to know when your Fertile Window is.  You are generally fertile for about five (5) days each month, with the ovulation day being the day when you are most fertile, with the highest chances of you being able to conceive.  Your Fertile Window is the 2 days before Ovulation Day, plus the Ovulation Day, plus two days after The Ovulation Day.


Step 1; Log onto


Step 2; Day 1 of your cycle is the date when you have a full day of flow.  So on the calender on the Ovulation Calculator, indicate the DATE of Day 1 of your last menstrual cycle.

Step 3; Length of your cycle is how many days it takes from Day 1 of one cycle to the next Day 1 of your cycle.  It is usually anything from 21 days, to 35 days, though for some it may be longer or even shorter.


Step 4; Click SUBMIT


Interpreting the Results:-

The Ovulation Calculator will indicate to you your days of expected ovulation, your Fertile Window, and also when your next monthly cycle is expected to start.



National Library of Medicine

Europe PMC

ObGyn Online Library

American Pregnancy Organization

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