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Ovulation calculation: Evaluate your ovulation period to conceive

Select the 1st day of your last period

Select the number of days in your cycle:

Please note, if your cycle is longer than 35 days or fewer than 21 days, or if you have an irregular cycle, these calculations may not be wholly accurate.

To have the best chances of conceiving, you should aim to make love a few days before and after your ovulation date. Since an ovum (egg) is only capable of being fertilised for 48 hours at the most, it's essential to know your ovulation date.

This ovulation calculator allows you to calculate your ovulation date, and work out your most fertile period.