Ovulation Calculator


Try our ovulation calculator to discover your unique cycle and when the best time to conceive may be.

When am I ovulating?


To maximise your chance of getting pregnant it can be best to look at the days you're most fertile as you can only get pregnant on the few days of each cycle around ovulation, when an egg is released.

On the ovulation calculator, the days shaded blue are the days your period is due – and a great tally for working out when it's time to take a pregnancy test.

How does your menstrual cycle work?

While the average menstrual cycle lasts 28 days, anything from 22 to 36 days is perfectly normal.

Right now, your body is shedding a combination of the lining of your womb (called the endometrium) and actual blood. You won't know whether your egg has been fertilised for another month but can still do things to focus on your fertility, such as eating a healthier diet and reducing your alcohol and caffeine intake.


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Your menstrual cycle explained

How to spot the signs and symptoms of ovulation

Some women can spot physical signs of ovulation occurring. Some symptoms include:

Conception and sex: How to boost your chances of conceiving

Now you know when you're most fertile, make the ovulation calculator results work for you and boost your chances of conceiving no matter where you are in your menstrual cycle.

How to use ovulation test kits

Ovulation calculators (also known as fertility calculators) are a good indicator of where you are in your menstrual cycle, however, every person is unique and so is their cycle, so it's important to take the results with a pinch of salt. The results may also be skewed if you are unsure when exactly your last period was, you have just come off the pill or your periods are irregular. If you’ve been trying for a while, talk to your GP.

One to two days before ovulation occurs, the body produces a surge of the luteinizing hormone (LH) which can be detected in urine. Ovulation predictor kits (OPKs) look for this surge and alert you to its presence - digital OPKs will display a symbol such as a smiley face.

This means it is likely you’re about to ovulate, so it’s recommended you have sex on the day of the surge, as well as the two days after. Play it safe by adding one more day onto this, just in case you’ve ovulated a day later than expected.

There are other ways of tracking ovulation, including a number of helpful apps. These apps can help you track your cycle and learn more about your ovulation patterns allowing you to get to know your body better from your phone or tablet.

Support when trying to conceive

Trying to conceive can be an emotionally draining experience, not just for you, but for your partner, too. Fertility Network UK offer support groups where you can share your ttc journey with others who are going through the same experience. You can also find other support lines to help with stress and anxiety here.

Brought to you by Mother&Baby

Our mum journalists work closely with our medical panel of midwives, doctors, paediatricians, child development specialists, parenting experts and many other field specialists to ensure the educational content you find here is up-to-date with the latest evidence-based medical information and accepted health guidelines.

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