Estimate your cycle

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

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

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