How accurate are predictions of the baby's due date

Calculate the due date: very easy + very accurate

Can't wait to welcome your child into the world? Are you already making plans for the birth? According to the World Health Organization, it is important to know the exact date of your expected due date. Only then can you plan your pregnancy properly. How and where do you start? First, you need to know what your due date is. With this calculator you can easily find the most likely date of birth.

  • The first few weeks of pregnancy are critical to the development of the fetus. For this reason, it is important to know the expected due date.
  • A normal pregnancy can last anywhere from 38 to 42 weeks. It is also considered normal for a woman to give birth 3 weeks before or 2 weeks after the calculated delivery date.

The expected date of delivery

All relevant information is only an estimate. Calculating the expected delivery date is not an exact science. According to statistics, only 5.54% of births occur exactly on the estimated due date. Because every pregnancy is unique. In fact, most babies are born a week before or a week after their expected due date. This means that around 95% of children are not born when they are expected.

It is normal for a woman to give birth two weeks after the due date or even three weeks beforehand. This is the case with 95% of all children born in the world. Nine percent of children are born prematurely. Premature birth is when a child is born more than three weeks before the due date. Children born two weeks after the calculated due date are said to be born late. This corresponds to about 1% of the total population.

Calculation of your pregnancy according to Naegele's rule

The Naegele rule, named after Dr. Franz Karl Naegele, is one of the standard methods for calculating your due date.
You can get the result by adding about 281 days (40 weeks) from when you last menstruated.

How to calculate your due date

To calculate your due date, simply add 40 weeks (280 days) to the first day of your last menstrual period. This is true if you have an average 28 day cycle. But every woman is unique. Therefore, due dates are only an estimate and not an exact finding.

Also, remember that your ovulation and menstrual period are counted as the first two weeks of pregnancy. So if you give birth on the due date, your baby will actually have developed for 38 weeks, not 40 weeks.

Other ways to determine the due date

If you are not satisfied with the way your due date is calculated, there are other ways you can set this date. Contact your doctor; using one of the following methods.

Let make an ultrasound image in the early stage. This allows the date of your due date to be predicted more precisely. However, if some doctors do this early on, they only do so for compelling reasons; for example, they recommend it if you have irregular menstrual periods, are 35 years of age or older, or if you have a history of difficult pregnancies or miscarriages.

You can determine your due date based on the "first few times". Some indicators can help predict your due date. These are moments like the first time you can hear the fetus's heartbeat (weeks 9-12) or the first time you feel movement (weeks 16-22). These observations can give you an idea of ​​the expected due date.

The size of your uterus

Your doctor can probably estimate the due date based on the size of your uterus at the first internal pregnancy exam.

The level of the uterus. Every time you visit a doctor during your pregnancy, your doctor will measure the highest point of the uterus. When this reaches your navel, it would mark the 20th week of your pregnancy. This clue can be used to estimate your due date.

Can my due date change?

Yes. It is not uncommon for your doctor to change the exact date again. This can happen for a number of reasons, but nothing to worry about. Reasons for this include irregular periods, uterine abnormalities, or early stages of pregnancy.

When to See a Doctor

Many parents still wonder when it is best to see a doctor. You should see a doctor as soon as you find out you are pregnant. Prenatal care is important for a safe and healthy pregnancy. The benefits of good prenatal care should not be underestimated. In addition to giving you and your baby the attention you deserve, certain complications or risks can be avoided so that you can get through the pregnancy well to the end. So book your first medical check-up as soon as possible!

At each prenatal exam, the doctor will examine the size of your uterus and monitor your child's health and development during pregnancy. During these visits you will also experience certain “first times” of your pregnancy. Hearing your baby's heartbeat and seeing it for the first time during the ultrasound are just a few things that come your way. Remember that due to certain factors, it is perfectly normal for your due date to adjust as your pregnancy progresses.


The excitement of finally welcoming the baby into the world is a feeling shared by many parents around the world. That's why everyone wants to know when to expect the due date. It is also very useful for you to start planning your birthing method and everything related to it. The exact date is an important piece of information used during prenatal care. Remember, this is just the beginning. Now that you know how to calculate your due date, they can finally steer your excitement in one direction, the day you tick on the calendar!

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