Due Date Calculator

Pregnancy Due Date Calculator: How to Use and Calculation Procedure

Every pregnant woman looks forward to the day when she finally gives birth to her child. They remain curious throughout the period about their due date. Mostly every doctor informs a tentative due date to everyone who is expecting a child.

However, some may be more curious and want to track their due date every trimester. So, now there is an option to predict your delivery date online with a due date calculator. To know how this tool functions and more details, continue with this piece.

How Is the Due Date Calculated?

There are multiple ways to calculate the delivery date. To determine an expected delivery date, using a delivery date calculator, you need to know either the first day of your last period or the date of conception.

In cases when a child is conceived via IVF, then the transfer date is used to calculate the expected date of delivery. However, if none of these dates is known, doctors use an ultrasound scan to find the delivery date.

Let’s now learn about these factors in detail.

1. First Day of Your Last Period

Generally, pregnancy lasts for around 38-40 weeks. So, count 40 weeks or about 280 days from the first day of your last menstrual cycle to find when you are due. Another way is to subtract three months from the last menstrual period and add seven days.

This is the most used method of finding one’s due date. However, you must also keep in mind that this is just an expected date. There is a chance that the baby will come early or a few days after the due date.

2. Conception Date

Only a few women actually know their date of conception. It is only possible if they track their ovulation symptoms. If you are one of them, then you can put that date in the pregnancy due date calculator to know your expected delivery date.

You can also use the traditional way, adding 266 days from the conception date. This will also provide you with an expected date. Nevertheless, knowing the due date is beneficial in many ways. Primarily it helps new parents to prepare for the baby.

3. IVF Transfer Date

If you have conceived using IVF or In-Vitro Fertilisation, you can use your transfer date to find your date of delivery. In this process, mature eggs are retrieved along with fertilised sperms. Then the fertilised eggs or embryos are transferred to the uterus.

After Day 5 embryo transfer, you need to count 261 days from your transfer date. Whereas if you go with the Day 3 embryo transfer, you need to count 263 days. So, depending on the type of transfer, put the date on the due date calculator.

4. Ultrasound Scan

Suppose you do not remember the first date of your last period, the conception date or even did not understand the ovulation symptoms. One way to find how far you are along is to do your first prenatal ultrasound.

Here are the following clues that help a doctor calculate the delivery date.

Early Ultrasound

Going through an early ultrasound can more accurately determine the delivery date. However, not every woman is prescribed an early ultrasound as it depends on the doctors they rely on.

While some suggest routine ultrasound, others only recommend it when periods are delayed, you are 35+, or you have a history of miscarriages. Sometimes, they prescribe this scan if they are unable to find the due date through a physical exam or last menstrual period.

Hearing Baby’s Heartbeat

Another clue that helps doctors determine the delivery date is by listening to a baby’s heartbeat. Generally, around the 9th or 10th week, doctors suggest a scan to monitor the foetus's heartbeat.

Sometimes later, when you start feeling the foetal movement, your doctor will suggest another scan around the 18th or 22nd week. This is to monitor the baby’s movement and also to speculate when your due date.

Checking the Fundal Height and Uterus Size

Another check performed by doctors is your fundal height. It is the measurement from your pubic bone to the uterus. This gap is checked every time you are visiting for a prenatal check-up. Monitoring this gap indicates how far you are from your due date.

Some doctors can tell an approximate delivery date by checking the size of your uterus during the initial prenatal exam. Although these factors indicate a more precise delivery date, you must be prepared beforehand.

How to Use the Due Date Calculator?

In just a few seconds, you can get an approximate date of your delivery using an online delivery date calculator. Here are those three simple steps which you can follow.

Step 1: Select a calculation method which is known to you from the dropdown menu. For example, your last period date or conception date.

Step 2: In the next cell, enter the date for ‘When Did Your Last Period Start?’

Step 3: Once you feed the details in the calculator, it will take a few seconds and show your expected due date.

Can a Due Date Change?

Most certainly, your due date can change. Doctors may sometimes change your due date as per your pregnancy progress. However, it is not something to worry about.

This change in the expected delivery date can have multiple reasons. For instance, you have irregular periods, abnormal fundal height, Alpha-Fetoprotein (AFP) is not within the range, etc. It can also result if you had the first scan in your second trimester.

The delivery due date calculator is helpful for individuals who are curious and anxious regarding their pregnancy. Knowing your baby's arrival is essential as it gives you time to plan and prepare. It also lets the doctor know about the baby's growth and development.

Another benefit of knowing the estimated due date is that it allows for tracking the baby's routine medical tests and other diagnostics.

FAQs About Due Date Calculator

All

How do online due date calculators work?

Online due date calculators show results based on the data provided by the user. The results are shown based on the date of the last period or the date of conception.

Are baby due dates exact?

More than 90% of babies are born two weeks before or after the expected date. Nevertheless, less than one in 20 babies are really born on the projected date (or 4.4%, if problems in pregnancy and other factors are taken into account).

Are boy babies usually late?

The truth is your baby's sex has very little to do with the length of pregnancy.

Do girl babies come earlier?

Boys and girls arrive at roughly the same time.

Is the first baby usually late?

First newborns are more likely to be a bit late between 41 and 43 weeks and less likely to be "on time" at 39 weeks.

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Disclaimer: This information is added only for informative purposes and collected from different sources across the Internet. Digit Insurance is not promoting or recommending anything here. Please verify the information before making any decisions.

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