More often than not, having confirmed that pregnancy has been established, expectant mothers are often very eager to know the date of delivery, partly because of the immense joy they would derive from the adorable day or the freedom from the ever growing bump, whichever it is, the fact remains that it is a day to look forward to. However, to know this ‘date to look forward to’, calculations have to be made, to predict the day. Which means, some simple arithmetic skills would be employed to provide an ‘estimated due date’ as it is often referred to in medical parlance.

While there are many ways of finding out your pregnancy due date, using a ‘pregnancy due date calculator’, ‘pregnancy confirm calculator’, or ‘pregnancy due date calculator’ has proven to be very fast, reliable and easy to use, as all that is needed to get an estimated due date is the date of the first day of your last menstrual period (LMP).

Therefore, once you access a pregnancy due date calculator, all that you would be required to fill in, is information about the first day of your last menstrual period, then the calculator does the rest of the maths and provides you with an estimated due date.

However, you would find it interesting to know that, without using a pregnancy due date calculator, you could find an estimated due date, without any stress or special process. All you need to know is the basic principle on which the pregnancy due date calculator earlier mentioned is based.

Here is how!

Since the gestation period in human being lasts from about 38 to 40 weeks, you could easily predict the due date, if you were quick in noticing your Last Menstrual Period (LMP). This is because, upon conception, ovulation ceases throughout the period of pregnancy, which gives you an opportunity to just add 38 or 40 weeks to the first day after your last menstrual period.

Another way in which you could also find an estimated due date is  by subtracting three (3) months from the first day of your last menstrual period (LMP), then adding seven (7) days, which gives you an estimated delivery date. That is, if your Last Menstrual Period (LMP) was  on May 20, subtracting three (3) months would give February 20, then, adding seven (7) days to this, would give February 27, which is the estimated due date. This date is referred to as an ‘estimated due date’ because, such predicted due date, does not usually turn out to be the true date of delivery, as the date of delivery may be one or two weeks before or after the estimated due date. This estimation however, holds true, if you are not pregnant with twins, triplets or other multiple number of babies, as the delivery of multiple babies usually takes place earlier than the estimated due date in most cases. However, some do take place as estimated, but it is usually very rare.