Conception Calculator Based on Due Date

When a woman is confirmed to be pregnant, both the mother as well as the father are eager to know, when will the baby be born. That is when, the gynecologist makes use of due date calculator, to predict the approximate arrival date of the new member of the family. However, after a few weeks, the parents want to know, when was their baby conceived. Conception calculator based on due date is the answer.

Conception Date Calculator
The two ways used to calculate the due date are using ultrasound and identifying the last menstrual period (LMP) date. Similarly to calculate the conception date, there are two ways. They are:

• Conception calculator based on due date
• Conception calculator based on last menstrual period

In this article we will concentrate on conception calculator based on due date.

Conception Calculator Based on Due Date
Under normal circumstances, women do not know the conception date, as it is very difficult to get the exact date. Women, who have undergone special procedures like in-vitro fertilization, or treatment for infertility, know the exact conception date.

When we use the pregnancy conception calculator, there are a couple of details, which you will have to always remember. A woman is normally able to get pregnant for approximately 5 days each month. This is true, because a sperm can stay alive for 3 to 5 days in the women’s reproductive track. Hence, if the intercourse happens a couple of days before or after the ovulation, the woman can get pregnant. Ovulation and conception occur on an average 14 days before the next menstrual cycle is due. This is true, if the menstrual cycle of the woman is normal and is of 28 days. If the menstrual cycle is longer, then the day of ovulation and therefore pregnancy, will be more than 14 days. The average length of the menstrual cycle ranges from 22 to 44 days. A 44 day menstrual cycle is, however, rare. When the health care providers calculate the due date, they often consider the menstrual period cycle to be of 28 days. Therefore, chances are high, that the baby may arrive a little later or earlier, than the predicted due date.

The due date is calculated by adding 266 days to the date of ovulation and fertilization. The alternative method is to add 38 weeks to the date of ovulation and fertilization. The duration of a normal pregnancy is anywhere between 38 to 42 weeks and the average term pregnancy is 40 weeks. Hence, to calculate the conception date based on due date, the reverse calculations will have to be implemented. Read more on pregnancy symptoms.

Let us take an example to understand, how to calculate the conception date, using the menstrual cycle. For example, the last menstrual period was on 1 January 2009.

Cycle Days	Conception Date*
25 day Cycle	12 January 2009
26 day Cycle	13 January 2009
27 day Cycle	14 January 2009
28 day Cycle	15 January 2009
29 day Cycle	16 January 2009
30 day Cycle	17 January 2009
31 day Cycle	18 January 2009
32 day Cycle	19 January 2009
33 day Cycle	20 January 2009
34 day Cycle	21 January 2009
35 day Cycle	22 January 2009
36 day Cycle	23 January 2009
37 day Cycle	24 January 2009
38 day Cycle	25 January 2009

^{* - The values in the table are approximate values.}

Conception Calculator Boy or Girl
It is very difficult and complicated to explain, how to calculate if it is going to be a baby boy or a baby girl. The last menstrual period date and exact ovulatory cycle information is required to find it out. Among numbers of ways available, the Chinese lunar pregnancy calendar can help in predicting the gender of the child.

Read more on

• Trying To Conceive A Girl
• Trying To Conceive A Baby

The gender of a baby is determined by chromosomes. When a sperm carrying ‘X’ chromosome fertilizes an ovum, the baby conceived will be a girl. On the other hand, if a sperm carrying ‘Y’ chromosome fertilizes an ovum, it will be a baby boy. The date for screening is usually the 62nd day after the start of the last menstrual cycle.

Conception calculator based on due date will is dependent on the due date. Therefore, the date will always be an approximation.