Free Ovulation Calculator - Track Your Fertile Days Instantly

A free ovulation calculator is an easy-to-use and efficient tool that assists women in monitoring their menstrual cycles and pinpointing their most fertile days. By entering key information, such as the first day of the last period and the average cycle length, the calculator estimates the ovulation period, simplifying pregnancy planning or fertility tracking. This tool is especially valuable for those aiming to conceive, as it offers a clearer understanding of the fertile window when conception is most likely. With its simplicity and accessibility, an ovulation calculator enables women to take charge of their reproductive health confidently.

In addition to predicting ovulation, many calculators offer insights into hormonal changes and cycle irregularities, making them a versatile resource for reproductive health. They can also help women avoid pregnancy naturally by identifying non-fertile days. With customizable features and mobile-friendly options, these tools fit seamlessly into modern lifestyles, providing personalized support for family planning and overall well-being.

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.
 
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Start of your last period

 
20%

Likelihood of ovulating on this date


Change my informations

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

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