Fertility Calculator

Use our free online fertility calculator to determine your peak fertility dates for the coming year. This can be especially helpful for couples who need to time for "baby-making sex".

This calculator is based on the fact that -

  • Ovulation occurs 14 days before the next menstrual period is due; and that
  • fertility peaks on the day of ovulation, and for 4 days prior to this.
Just enter :
  • The first day of your last menstrual period ( the day the bleeding starts)
  • The length of your menstrual cycle ( number of days from the first day of your period to the first day of the next period)