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Ovulation Calculator

Trying for a baby? To increase your chances of getting pregnant, you need to have sex during your fertile period, near the time of ovulation, so use our tool to find out when this will be.

	To determine when you're most likely to conceive, enter the first day of your last menstrual period:

	Average length of your menstrual cycle:

While the calendar can be helpful, paying attention to all the cyclical factors such as dates, body temperature and cervical mucus will help you chart your cycle and work out your most fertile days. Also see:

Our Trying for a baby section
Your top ten most common fertility questions

NB This tool is designed to give you approximate dates only based on a regular menstrual cycle. If your menstrual cycle is irregular you may find this tool alone is inadequate for pinpointing your ovulation times.