A pregnancy conception calculator can help you determine your pregnancy conception date, which is the date your baby was conceived, based on the due date of the pregnancy. If you are unsure about when the baby was conceived and would like to find out based on the due date/ birth date or the first day of your last menstrual period, you can input these into the conception calculator for results. The conception calculator will give you a range of days in which conception may have occurred.

Use The Conception Calculator to estimate probable conception dates
from Birth, LMP and Due dates.

These estimated conception dates are based on an average cycle of 28 days.

To use the calculator:
1 Choose either the
Due Date / Birth Date or
the First Day of Your Last Menstrual Period,

2 Enter the date, and
3 Click the 'Calculate' button.

First Day of Last Menstrual Period: 

Probable Fertile Window (Ovulation):  ?

Possible Dates of Conception:  ?

Due Date:   (40 weeks)

How Does It Work?

The conception calculator figures the gestational age of the baby to determine the date of conception. Since the exact date of conception is hardly ever known, the conception calculator can use the first day of the last menstrual period (LMP) you have to determine the range of days in which conception would have occurred.

You can also use the conception calculator if you know the due date of your baby. The baby can typically be measured 5 or 6 weeks after your last menstrual period to determine the gestational age of the baby and the approximate due date.

If you know either of these figures, you can input this information into the conception calculator along with the current date to find out the possible days of conception. The conception calculator bases this off of the average 28-day cycle.

This process is based off of the assumption that every pregnancy is typical, that the pregnancy lasts 40 weeks, and that each woman has a 28 day cycle.

In order to calculate the estimated conception date, the calculator will use the last menstrual period date, date back three months, and then add seven days to determinate your due date. With the estimated delivery date, it will count back 38 weeks to give an approximate date of conception

The conception calculator is great for mothers or expecting mothers who are interested in finding out when their baby was conceived. Other calculators, such as ovulation calculators, due date calculators, and sexual intercourse timing calculators, are useful for women interested in their fertility and pregnancy.

Facts about Conception

Women who experience regular period cycles typically conceive about 11-21 days after the first day of their last menstrual period. Determining the exact date of conception is difficult and so your conception date is mostly an estimate based on your period cycle.

Sometimes special cases, such as women who are artificially inseminated or use in vitro fertilization, are able to know the exact date of their conception.

In order to calculate your conception date, you need to know your estimated due date. Typically, your estimated due date is about 40 weeks from the first of your last menstrual period, but this is just an estimate. It is common for babies to not be born on their estimated due date.

Determining an estimated conception date is a good way to estimate your due date or even just to assess your baby’s growth.

Another way to find your estimated date of conception is through an ultrasound. Ultrasounds are typically conducted between 8 and 20 weeks of pregnancy, and are used to determine the gestational age of the pregnancy. The basal temperature method is another way to figure out the days past ovulation, otherwise known as your luteal phase, which are the days between ovulation and the day before your next period.

Some factors that affect the estimated conception date vary. Some women, even with regular period cycles, may have varying ovulation cycles. Also, sperm life can last from three to five days, and this can affect the moment that the pregnancy is conceived. Since conception is based off the regularity of the women’s cycle, factors such as stress can change these cycles monthly and make it difficult to pinpoint an exact conception time. Additionally, eggs typically take from 12 to 24 hours to shed, meaning that the conception date may be off by one day.

The only way to accurately know the exact conception date is if pregnancy is conceived through treatments such as artificial insemination and in vitro fertilization; otherwise the conception calculator can only give you an estimated idea of the time your baby was conceived.

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