Free Easy-to-Use Ovulation Calculator

Ink pen and black calculator isolated on wooden texture background

When it’s time to try getting pregnant, you may find out that it’s not as easy as it seems. You can increase your chances of conception by timing intercourse for your most fertile days, which would be when you are ovulating. But when does ovulation occur? Use our handy free ovulation calculator below to estimate your next ovulation cycle.

When Do You Ovulate?

This ovulation calculator will help you figure out the approximate days when you are the most fertile. If you have sex on the dates shown above, your chances of conception will increase. This calendar is an easy-to-read chart that tells you not only which days you will be fertile, but also the date when you can take a pregnancy test to see if your efforts have paid off!

However, please keep in mind that this is just an estimate and that there are many other factors involved in conception.

Using An Ovulation Calculator To Determine When You Will Be Fertile

You don’t need to worry about filling in complex charts! We just need two bits of information:

  1. The date that your last period started
  2. Your average cycle length

During the first month, you should keep track of how many days are in between your periods. This is the length of your cycle. Many women have a 28-day cycle, but it’s normal to vary by a few days. A normal cycle can be as few as 24 days or as many as 32.

Ovulation Calculator
When did your last period start?
E.g. 18/01/2020
Usually, how long is your cycle?
Cycles typically vary from 23 to 35 days
Estimate your ovulation day
likelihood of ovulating today
Due to your cycle length, unfortunately we can't estimate an ovulation probability. We recommend that you use a Digital Ovulation Test to accurately detect your most fertile days.
  *
Start of your last period
  20%
Likelihood of ovulating on this date
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In partnership with Clearblue®.
Results are based on the information you have provided and data from the publication below: Sarah Johnson, Lorrae Marriott & Michael Zinaman (2018): “Can apps and calendar methods predict ovulation with accuracy?”, Current Medical Research and Opinion, DOI:10.1080/03007995.2018.1475348

With that basic information entered in our ovulation calculator, we’ll be able to predict when you’ll ovulate next, including the dates when conception will be most likely. Once you understand when you’re most likely to ovulate, you can try to conceive during that time and increase your chances of conception.

Please note that these calculations are only an estimate based on an average cycle length. If your menstrual cycles are not regular, this ovulation predictor may not work for you.

An ovulation calendar may not be accurate if your personal cycle is longer than 35 days or shorter than 21 days. Additionally, if your menstrual cycle is unpredictable or irregular, it may not be accurate. If you’re having problems conceiving and aren’t sure when you’re ovulating each month, talk to your doctor for personal medical advice.

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Due Date Calculator
When did your last period start?
Generally, how long are your cycles?
Calculate your due date
Your baby is likely to be born on or around*
*Only your physician can accurately determine your due date or the date of your conception based on his/her knowledge of your complete medical condition.
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In partnership with Clearblue®.

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