Guide to a Due Date Calculator by Conception Date

How far along are you? Is it a boy or a girl? When are you due? These questions are most commonly asked of pregnant women. The earliest possible answer you can offer is the expected date of delivery, or EDD. By far, you can figure out the most accurate answer using a due date calculator by conception date. Other means to find the EDD approach 98% accuracy and are not bad indicators.

The date that childbirth is expected is computed either by the age of the pregnancy or the age of the fetus. Gestational age calculates the time lapse since the first day of the last period of menstruation. Embryonic age calculates the passing of time since the first day of conception or fertilization. Gestational age is typically 2 or 3 weeks more than embryonic age. A due date calculator by Age calculator conception date is more accurate because it measures the embryonic age or the actual age of the fetus.

Pregnant women are more familiar with their menstrual cycle, so gestational age is easier for them to grasp. When the phrase “weeks pregnant” is used, most likely it refers to gestational age. To wit, a woman may be 12 weeks pregnant with a 10 week old fetus. The LMP (last menstrual period) formula computes the expected date by adding 40 weeks (9 months and 6 days) to the first day of the last menstrual period and then subtracting 14 days. Naegele’s rule adds 7 days to the first day of the last menstruation and then subtracts 3 months.

The problem with either formula is it does not take into account that not all women have a regular menstrual cycle or predictable ovulation period. “So how do I know when I am having my baby?,” you might ask. Pregnancy lasts some 38 weeks after conception. The most popular means of determining the actual age of the fetus, effectively the most popular due date calculator by conception date, is by using an ultrasound to ascertain the stage of fetal development. Most doctors nowadays use this EDD finder. There are computer software available that likewise calculate by embryonic age or conception day.

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