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Ovulation Calculator


To increase your chances of getting pregnant, our ovulation calculator will help you forecast your fertility in a simple calendar format. Simply tell us the first day of your last period, and how long your cycle usually lasts (between 20 and 45 days).

NOTE: If your menstrual cycles are irregular, you may have trouble pinpointing your ovulation day based on this calendar alone, and may need to use an ovulation predictor kit.

How it works

Use our interactive fertility calendar to find out the days you are most likely to ovulate and fall pregnant.

When did your last period start ? (DD/MM/YYYY)

Adjust the length of your cycle if necessary