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)