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Ovulation Calculator

What was the first day of your last period?

Date :
Average Days in Cycle:

Your next predicted ovulation date:

If you have a regular cycle of between 21 and 35 days, use our free online ovulation calculator to estimate your ovulation date. To calculate the number of days in your cycle count the number of days from the first day of your period to the day before your next period. Your fertile window is a 6 day period starting 5 days before ovulation and including the day you ovulate.

Please note that this is only a prediction and to gain certainty we recommend testing using ovulation tests or a fertility monitor.