Enter the first day of your last period and your cycle length to see your most fertile days, test date and due date.
An egg can be fertilized for about a day after ovulation, and sperm can survive for three to five days in the body. This means the days when intercourse can lead to pregnancy run from about five days before ovulation to a day or two after it. The chance is highest in the two or three days just before and on the day of ovulation. This calculator estimates the window from your cycle, so it works best if your cycles are regular.
Ovulation usually happens about 14 days before the next period. So for a 28 day cycle it falls around day 14, and for a 35 day cycle around day 21. The calculator counts from the first day of your last period, adds your cycle length, and goes back 14 days to find the ovulation day. It then shows the most probable conception days, the ovulation window and the best days for intercourse around it.
A home pregnancy test is most reliable from about the day your next period is due, though some tests can pick up pregnancy a few days earlier. The calculator suggests a date five days before your next period. If you do become pregnant this cycle, your due date is 280 days after the start of your last period, adjusted if your cycle is longer or shorter than 28 days. The table lists the same dates for the next six cycles.
In the days just before ovulation and on the day itself. The calculator shows the most probable conception days as a range of about six days around the estimated ovulation date.
Ovulation usually happens about 14 days before your next period starts. Count from the first day of your last period, add your cycle length, and subtract 14 days.
Sperm can live for three to five days in the female body, so intercourse a few days before ovulation can still lead to pregnancy.
The most reliable time is on or after the day your period is due. The calculator suggests a date five days before the next expected period, which some sensitive tests can detect.
Yes. If your cycle length varies a lot, ovulation is harder to predict, and these dates are less reliable. Ovulation tests or tracking your temperature can help.
Pick another tool to jump straight to it.