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Ovulation Calculator – Find Out The Best Time To Try & Conceive

This ovulation calculator works out the ‘fertile window’ of your menstrual cycle i.e. the best time for you to try and conceive.


Having a good understanding of your fertility is vital when you are trying for a baby. The more information you have about your body, your cycle and your fertile window, the greater are your chances of conception success.

The only time a woman can technically conceive is during the fertile window of the menstrual cycle. The fertile window lasts six days in total, five days before ovulation through to the day of ovulation. This window will vary depending on the individual’s cycle.

However, the likelihood of becoming pregnant is significantly increased if you have intercourse in the three days leading up to and including ovulation. During these three days your body is primed to conceive.

Note: The calculations provided are only estimates based on averages and should be treated as such. You should consult a fertility specialist if you require a proper diagnosis.

Ovulation Calculator – Input Your Details

  • Your fertile window is between days:
  • Your most fertile time is between days:
  • Your predicted ovulation day is:
  • If you conceive within this timeframe, your estimated due date will be .
The Ovulation Calculator is one tool in your armoury. There are other methods of checking your fertility potential and you should make use of them all.
Read our article How Fertile Am I? to make sure you have all the information you need.