ovulation calculator

increase your chances of getting pregnant

Let us do the math! Use our ovulation calculator to find out when you're most likely to be ovulating and hence most fertile. We'll also tell you your approximate due dates if you do conceive on one of these "fertile days", and build a printable three-month fertility calendar to help you keep track of you cycle.

Just enter the first day of your last menstrual cycle and the length of your cycle, and we'll tell you when you're most likely to be fertile over the next three months.

Enter the date of the first day of your last period:

Note: This tool provides approximate dates, and is best suited for women with regular menstrual cycles. Be sure to read understanding your ovulation cycle for more information about fertility signs and timing your best chances.