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Ovulation calculator

What was the first day of your last period?

What is your average cycle length?

Our ovulation calculator will tell you when you’re most likely to be fertile over the next six months. To increase your chances of getting pregnant, just tell us the first day of your last period and how long your cycle usually lasts (between 20 and 45 days).

How does the ovulation calculator work?

Most women ovulate about two weeks before the first day of their period. Our calculator works out when your cycle will end, and counts back two weeks to estimate when you may ovulate. You will be fertile in the days leading up to ovulation, as well as the day itself, so the ovulation calculator will show your entire fertile window. This is the best time of the month for you to have sex if you're trying for a baby.

The ovulation calculator also shows you all your upcoming fertile days, and when your baby will be due if you do conceive. So you'll have all the information you need to start planning your pregnancy.

NOTE: This tool provides approximate dates only and assumes a regular menstrual cycle. If your cycles are irregular, you may have trouble pinpointing your day of ovulation based on this calendar alone. Find out about ovulation predictor kits (OPKs).

How will I know if I'm ovulating?

You can look for signs that you might be ovulating. One way to check is to record your basal body temperature each day. Many women see a spike in their temperature shortly after ovulation, so this can be a sign that you've ovulated. You might also want to check your cervical mucus each day, as this can change colour and texture throughout your cycle. For more information, see our guide to tracking your fertile days.
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