Updated: 3 August, 2019

What’s about the pregnancy due date calculator? If you are a pregnant woman, you are probably interested in when you are due for delivery. You are not alone as millions of first time pregnant women across the globe also want to have a clue about when their babies are due.

You may have been making marks on your calendar or counting the days on your fingers and toes, they are commendable but inefficient efforts. The easiest and best way to have a good idea of your due date is to use a pregnancy due date calculator. 

What is a due date calculator? 

This calculator is designed for bailing out pregnant women from their anxiety about when their baby is due. It will calculate and predict the due date so that such pregnant women will be adequately prepared for the arrival of their bundle of joy. Having said that, how does this calculator calculate the due date? 

How is due date calculated? 

The calculator uses a simple principle to make an estimated calculation of your due date. It does this by adding 280 days to the beginning of your last menstrual period, assuming that your menstrual cycle is 28 days.

In this case, your ovulation and menstrual period are considered as the first 14 days of your pregnancy. This will put your baby at 38 weeks old if you deliver within the estimated due date.

You should also note that some women have menstrual cycles that are below 28 days. This will impact the reading of the calculator, since it usually takes a menstrual cycle as 28 days.

Perhaps you want to have an idea of the length of your menstrual cycle. Not a bad idea. You can work out the length by counting from the first day of your last menstruation to the first day of the next one. This is 28 days on the average. So, add 280 days to your last menstruation and you have an estimated date of your delivery date. The pregnancy is estimated to last for between 37 and 42 weeks.

As it is repeatedly said, this is just an estimated date. Each pregnancy has its own peculiarity which makes generalization of delivery date unrealistic. Only 5% of delivery takes place within the estimated period while most deliveries take place a week or two either side of the estimated date. If you are concerned about your due date, consult your physician. They will carry out due date test to give you the estimated due date and some important information such as:

  • Conception date.
  • Due dates for multiples.
  • Prenatal testing dates.
  • Baby status which includes size, heartbeat etc.
  • Trimester stages.
  • Celebrities who share the birth date.
  • The due day in history. 

This information will guide you while making preparations for delivery and subsequent care of the baby.


Having pre-knowledge of your due date can be of help in putting your anxiety behind you and concentrate on the arrival of the baby. As such, you can concentrate on the more important things, your health and that of the unborn baby. Do whatever is necessary to make the due date a memorable one for you and your baby.

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Table Of Contents

clickable navigation

Chapter 1 – What is a due date calculator?

Chapter 2 – How is due date calculated?

Chapter 3 – Conclusion


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