# How to calculate pregnancy due date?

Delightfully exciting news of pregnancy is enough to make you feel on top of the world. Well, you have every reason to feel that way, but at the same time it is necessary that you keep your feet on the ground because there are practicalities to take note of as well. One such practicality relates to the determination of pregnancy due date - the date on which you can expect the arrival of your little bundle of joy.

## Pregnancy due date - some tips

• It is always preferable relying on the estimation of health care facilitator, gynecologist or the family physician you are tied up with regarding the expected date of delivery.
• There isn't any harm in gathering information from several other sources including that of the web centric ones.
• But before you check up with other sources, do make it a point to have the pregnancy due date ascertained by the medically relevant authority.
• Thereafter, you can always have it cross checked with other options available.

## Calculation of pregnancy due date

• Dr. Naegele was the first to come up with a formula guiding the determination of due date.
• The principle developed way back in 1850; seeks to calculate expected date of delivery on the basis of the approximate span of human gestation.
• According to Dr.Naegele's calculation; human gestation does not usually surpass the span of two hundred and sixty six days (266 days). Bearing this in mind, Dr. Naegele devised a formula.
• One of the basic prerequisites relates to the information of the last menstrual period. The date marking the beginning of LMP is to be taken as the basis.
• You need to add 7 to it in order to arrive at a resulting number. From the resulting number, you are required to deduce 3 months.
• So if the date marking the beginning of the LMP is 1st of December 2011, you are to add 7 to it to get the resulting date of 8th December.
• The resulting number is 8th December and from this, you have to deduce 3 months to arrive at the figure of 6th September 2012.
• Thus, you can expect delivering the little one on the date of 8th September.

Related Link → Online interactive Preganancy Wheel to find out due date

## Factors for calculation of pregnancy due date

• There are evidences to prove that the estimated span of gestation may vary and may not necessarily adhere to the gestating span calculated by Dr.Naegele.
• According to the advanced research and findings, factors such as the onset of quickening, relevant monitoring of the fetus's heart rate and gradual growth rate of uterus also have roles to play in determining the expected date of delivery.
• Racial and nutritional differences can similarly influence gestating span.
• On account of the role played by the aforementioned factors - the approximate date may either delay or have itself proponed by a week or two.

#### Ultrasound and due date

One of the recent inputs of techno savvy precision - ultrasound can be particularly effective in ascertaining the expected date of delivery. But in order to ensure due accuracy, ultrasound has to be carried out during the initial phase of pregnancy, preferably in its first trimester.

## Use of pregnancy calendar in ascertaining the due date

• There are umpteen numbers of web facilitated pregnancy calendars guiding you with an approximate idea of baby's growth and expected time of delivery.
• There are pictorial comparisons to help you track and analyze the expected rate of development.
• For instance you can gain an overall graphic insight into the fetus's growth during the fifth week of pregnancy and how it may vary from the weeks to come subsequently.
• Pregnancy calendars also provide pictorial representation of ultrasound pictures.
• Thus, besides having weekly insight into the relevant points of comparison, you will be able to have an access to pictorial details of the expected development as unveiled through the mechanism of ultrasound.
• Consequently, you will be able to roughly figure out when and at which phase of development you are more likely to deliver.
• For the confirmation as to the expected date of delivery, you will be required to merely type out the first date marking the beginning of your last menstrual cycle with due inclusion of month and year of occurrence.

## Pregnancy Due date determination

• There is another slightly improvised way guiding the calculation of due date. For this you need to keep a track of your menstrual cycle and its overall monthly pattern.
• Besides mentioning the first date of the LMP, you need to mention the average span of the luteal phase. Luteal phase covers the time following ovulation and the first day marking the beginning of the menstrual period.
• Analysis of the last few menstrual cycle or maintenance of basal body temperature can help you ascertain the day of ovulation.
• Apart from LMP and approximate span of luteal phase, you need to provide details about the approximate span of monthly cycle/ the monthly pattern followed by it.
• The inputs fed into your system will point to the expected date of delivery.