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Vhi Ovulation Calculator

Hoping to hear the pitter patter of little feet soon? Our ovulation calendar can help. With a few simple steps, it can let you know the days you will be most fertile.

Time for the science bit. Tracking when you are ovulating can help increase your chances of getting pregnant. Ovulation is simply the release of an egg (or ovum) from the ovaries, after which it’s available to become fertilized by sperm and result in pregnancy.

To give you the best chance of getting pregnant, use the ovulation calendar to track the first day of your last period. This is often referred to as the ‘LMP’ – or put simply, the last menstrual period. Next put in how long your cycle usually lasts. For many women, this is between 20 and 45 days.

You’ll then be told the best days to have sex with a view towards conceiving.

One more thing – note that sperm can typically survive for up to five days in your body. Your egg can typically survive for up to one day. You may have a “fertile duration” of about six days, from the five days before ovulation to the day itself.

Use the calculator below to find out when in your cycle you’ll have the best chance of conceiving.

Of course, you needn’t restrict yourself to having sex solely on these particular days. Personal ovulation patterns vary. The above is simply a guide to help identify which days may potentially be at your most fertile. Don’t feel at all obliged to wait for these specific days to have sex if you’re looking to conceive.

Ovulation Calculator

The Ovulation Calculator will tell you when you are releasing an egg each month, and therefore when you are most fertile. For the best chances of conceiving you should be having sexual intercourse on these days.

How long is your cycle?

When was the first day of your last period?

Your most fertile days for your next cycle are


The calculations on this site are estimates and content is provided for general information only. It should not be treated as a substitute for the medical advice of your own doctor or any other healthcare professional. Always consult your own GP if you're in any way concerned about your health.



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