Ovulation calculator

If you’re trying to fall pregnant, the timing of when you and your partner have intercourse is critical.

IVFAustralia's Ovulation Calculator will help you understand your ‘fertile window’ – or your window of opportunity to fall pregnant during a normal menstrual cycle. You should be having sex every couple of days during your fertile window.

For our Ovulation Calculator to be the most accurate and useful, you’ll need to keep track of the dates of your recent menstrual periods. 

Your cycle length is the number of days between the first day of bleeding of one period, and the first day of bleeding of the next. This can vary from 23 to 35 days, and 28 days is about average. If you have irregular menstrual cycles, calculating your ovulation date can be more difficult, but we suggest going by your shortest period date to ensure you don’t miss your ovulation date. Ovulation urine tests can give you some idea of your fertility window, or you might find further advice from your GP or fertility specialist useful.

How to calculate your fertile window

To calculate your fertile window, you need to determine what day you ovulate. To do this, you need to know the length of your menstrual cycle (which tends to vary from 23 to 35 days).

The length of your menstrual cycle is the number of days from the first day of bleeding in your last period, to the first day of bleeding in your next. From this figure, subtract 14 days from the end of your current cycle to determine the approximate day you ovulate.

What if I have irregular menstrual cycles?

If you have irregular menstrual cycles, or your cycle length varies from month to month, it will be difficult to calculate your ovulation date. Ovulation urine tests or ovulation tracking may be useful, and you should consider seeking further advice from your GP or a Fertility Specialist.

How long should I try for, before seeking specialist advice?

It is recommended that you consider seeking professional advice after trying to conceive naturally without success for 12 months if you are under 35 years-old or after 6 months if you are over 35.

fertility specialist can conduct some simple fertility tests to find out what’s happening, explore all your options and help you fall pregnant sooner. 

Ovulation cycle tracking

Ovulation cycle tracking can help you confidently understand your fertile window by tracking your hormone cycle and detecting the hormone surge associated with ovulation. Read more about ovulation cycle tracking...

Fertile Minds

Fertile Minds YouTube Channel

Watch helpful videos on all things fertility, from how to track your cycle and the best time to have sex to conceive, to gaining knowledge about female fertility factors such as endometriosis, fibroids and PCOS. Check out the Fertile Minds playlist here.

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