Ovulation Calculator – Know Your Fertile Days

Determine your most fertile days and increase your chance of conceiving.

When did your last period begin?
Please enter a valid date.
What is your average cycle length?
Start with the first day of one period and count right up to the day before the first day of your next period. Count the first day of bleeding or spotting as day one. The average cycle length is 28 days, but can range anywhere from 20 to 45 days.
Calculate My Best Days to Conceive

Your best days to conceive are

Your likely due date would be

Other future fertile days:


Only your physician can accurately determine your due date or the date of your conception based on his/her knowledge of your complete medical condition.