A conception calculator is a simple method of estimating the gestational age of a pregnancy by placing the date of conception at the first day of the mother's last menstrual period, explains BabyMed. It is impossible to ... More »

A pregnancy due date calculator calculates a due date by counting 40 weeks from the day that the last menstrual period started, according to BabyCenter. This method assumes that conception occurred two weeks after the la... More »

You can calculate the month you conceived a baby by using the due date, according to BabyMed. BabyMed provides a conception calculator that allows you to enter your due date and get a five-day window of when you conceive... More »

To determine the date of conception, use an online ovulation calculator found on WebMD or BabyMed. Alternatively, women can identify the last menstrual period that they have had and add 40 weeks to determine due date, wh... More »

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Calculated conception dates are always an estimate, the American Pregnancy Association explains, and the presumed date of conception is generally between 11 and 21 days after the first day of the woman's last menstrual p... More »

Using a pregnancy test calculator is easy and simply requires inputting individual data including the date of the woman's last period as well as the typical length of the menstrual cycle, reports WebMD and BabyMed. Pregn... More »

The exact date of conception is too difficult for anyone to find out, but doctors use the first day of the last menstrual cycle to determine the age of the fetus, according to WebMD. When a woman has regular periods, she... More »