Ovulation Calculator

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

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

Fill in:
1. When did your last period start?
2. Usually, how long is your cycle?
3. Estimate Your Ovulation Day ->

* fields remain white after filling in, don’t worry, the computer automatically calculates your date correctly after clicking:
Estimate Your Ovulation Day ->