Ovulation Calculator

Are you currently trying or thinking about trying for a baby? If so the ovulation calculator can help. To optimise your chances of getting pregnant you need to be aware of your most fertile period, which is around the time of ovulation. This can be calculated using our free ovulation calculator.

By using the ovulation calculator you can determine which days you are most likely to conceive. All you need to do is input the first day of your last period and the usual length of your menstrual cycle. The free ovulation calculator will then tell you when your most fertile days are.

Date of last period


Average length of menstrual cycle



The ovulation calculator gives approximate dates and may not be accurate if you have irregular menstrual cycles.

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What is Ovulation?

Ovulation refers to the release of eggs from a woman's ovaries. This happens in monthly cycles that usually last 28 days.


The most fertile time is when the egg is released from the ovary (about 14 days before the end of the cycle). The egg then enters the fallopian tube where fertilisation can occur.

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