How to calculate your expected due date. Calculate due date using a calculator

Pregnancy is one of the most exciting and at the same time responsible periods in the life of every woman, and therefore it is not at all surprising that each of us wants to know the date of birth as soon as possible. However, this issue often causes numerous disagreements and disputes. Expectant mothers “torture” doctors with their questions, because they want to prepare for an important event, but they just shrug their shoulders, because they are not able to accurately determine the date of birth of the long-awaited baby.
In order to Calculate the due date, click the “find out due date” button.

Date of the first day of the last menstruation: 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 January February March April May June July August September ь October November December 2012 2013 2014 2015 2016 2017 2018 2019 2020

Today: 18.04.2019
Date of the first day of last menstruation:
Conception most likely occurred (+-2 days):

Estimated due date:
Time left before giving birth:

The estimated date of birth (EDD) is calculated in several ways, each of which is approximate. That is, if according to calculations the baby should be born on January 1, then it is not a fact that this will happen with one hundred percent accuracy on this very day. Very often there are deviations from the expected date in one direction or another. And labor can begin either 2 weeks earlier or later. I bring to your attention a fairly simple, but very effective way to find out the probable due date of a child, which has been successfully used by many doctors in clinics for quite a long time.

Calculation based on the last day of menstruation

So, to independently calculate gestational age and using it to determine the expected day of birth, you need to remember the start date of the last menstruation. It is on this basis that all calculations are made. From this date you need to subtract 3 months and add another 7 days to the result. The resulting number will be the expected due date of your long-awaited baby.
For example, the date of the last menstruation is April 22. This means that 3 months must be subtracted from this date. We take away and receive - January 22. We add another 7 days to this figure and get January 29 - this day will be the expected date of birth.
It is worth noting that this method of calculation is best suited for women with a regular menstrual cycle, which lasts 28 days.

4 Alternative Ways to Calculate Due Date

• 1. You can find out the due date with fairly high accuracy by visiting a gynecologist’s office. The doctor will not order any tests for this, he will simply measure the size of the uterus, which will increase in size according to the age of the fetus. However, this method of calculating the date of birth of the baby is effective only in the first trimester of pregnancy. In the later stages (in the 2nd and 3rd trimester) in each woman, an increase in the size of the uterus occurs with varying intensity, depending on the individual characteristics of the body.
• 2. You can calculate the date of birth based on ovulation, which is the most favorable period during which conception most likely occurs. On such days, a woman usually experiences increased sexual desire. In addition, her discharge (cervical fluid) becomes stickier and thicker, basal body temperature rises by several tenths of a degree, the cervix rises, and the mammary glands become dense and painful.

So, to find out when your baby will be born based on ovulation, you need to add 280 days to this day (the duration of pregnancy). The resulting period will be the date of birth. If the period in which ovulation occurred is unknown, then calculate the middle of the last menstrual cycle, and then add the rest to it.
In the same way, you can perform calculations based on the date of conception. However, you should be aware that this period does not always coincide with the day on which sexual intercourse occurred. Fertilization of the egg, as a rule, occurs only on the third day.

• 3. Hardware calculation using ultrasonic waves can also be considered one of the most effective methods that allow you to determine the due date with an accuracy of 1-3 days. The most accurate calculations will be if an ultrasound is done during the 11-14 weeks of pregnancy.
• 4. His first movement, which usually occurs at the 20th week (for first-time mothers) and at the 18th for the second and subsequent pregnancies, will help declassify the secret of your child’s date of birth. In ancient times, when there was no ultrasound, this method of calculating the due date was almost the only one.

As soon as the expectant mother feels the first tangible tremors of her baby in her stomach, 20 weeks should be counted from that moment. The resulting date will be the probable day of birth of the child. If the birth is not the first, movements are usually felt earlier - at 18 weeks, so you will have to add not 20, but 22 weeks to this period.

The effectiveness of hardware methods in calculating the due date

Examination of the fetus in the third trimester using an ultrasound machine makes it possible to accurately determine the date of pregnancy, and therefore the expected due date. The fact is that only with the help of ultrasound diagnostics can a doctor observe the condition of the placenta, the position of the baby’s head in relation to the entrance to the pelvis, the level of opening of the cervix, signs of fetal maturity, as well as many other important factors. All these parameters are decisive in determining the readiness of the unborn baby and his mother for childbirth.

Is deviation from the deadline normal?

As mentioned above, all calculations of the expected due date are nothing more than a rough guideline that should not be relied heavily on. According to statistics, only 17% of women give birth on the appointed day, while the remaining 83% give birth either earlier or later. Thus, we can conclude that no specialist, no matter how smart and qualified he may be, can predict with high accuracy the date of onset of labor.
Normally, birth can occur between 38 and 42 weeks. pregnancy. The birth of a child will be neither premature nor late, but normal and physiological. Sometimes, for certain reasons, labor may begin prematurely. This happens due to abnormalities in the development of the fetus, stressful situations, various pathological processes occurring in the mother’s body, hereditary factors, etc.
Pregnancy often goes beyond that due to complications in the first trimester. In addition, maternal inheritance should be taken into account. If your mother and grandmother gave birth much later than the due date, then most likely the same thing awaits you. Therefore, it is very important to realize that calculating the due date is a very complex, conditional and individual issue for each expectant mother.

How do the characteristics of the menstrual cycle affect the date of birth?

The duration of a woman's menstrual cycle also influences the due date. For example, if it exceeds the standard twenty-eight days, then most likely the pregnancy will last more than forty weeks, and vice versa. However, in this case, the deviation in one direction or another usually does not exceed 5 days. It is worth noting that in such calculations errors are often made, since very often normal bleeding that opens after fertilization of the egg is mistaken for menstruation.

As soon as you find out that you are pregnant, you are filled with incredible joy. At first, you walk around and just give everyone your happiness. Over time, when the period gets a little longer and the first euphoria wears off, you can’t wait to find out when your baby will be born. You want to plan your birth by at least knowing approximately when the day will come so you can be prepared for anything. Today we will tell you how to calculate your due date.

Pregnancy is always a joy

Due date calculator

Calculation of due date

Beginning of last menstruation:

Average cycle length:

(from 22 to 45, usually = 28)

22 days 23 days 24 days 25 days 26 days 27 days 28 days 29 days 30 days 31 days 32 days 33 days 34 days 35 days 36 days 37 days 38 days 39 days 40 days 41 days 42 days 43 days 44 days 45 days

Duration of the luteal phase:

(from 9 to 16, most often = 14)

9 days 10 days 11 days 12 days 13 days 14 days 15 days 16 days

How to calculate the due date based on the date of conception?

To be completely honest, everyone wants to know their due date. There are two ways:

How else can you calculate your due date?

There is another method that is popular with doctors. With this method, calculating the due date is not as difficult as many people think. Initially, you need to decide what kind of cycle you have. After this, you should remember the last time you had your period. The calculation should be based on when your last period was. In medicine, the first day of menstruation will already be considered as the possible birthday of your child. The estimated date will be calculated from weeks, which are also called medical weeks of pregnancy. What is the difference?

Everything is very simple. If in ordinary life we ​​are accustomed to the fact that pregnancy lasts exactly 9 months, that is, approximately 36 weeks, then according to medical standards this period is 4 weeks longer. In simple terms, the pregnancy will last 40 weeks. The expected date of birth is calculated from the critical days plus 40 weeks. Calculating all this is quite simple. You shouldn't get confused.

The estimated date of birth determined in this way is considered not entirely reliable, and doctors do not rely on it.

You just need to know your cycle and know when the last day of your period is. The preliminary date of birth is calculated very easily. There is a special calculator that will help make the calculation quick. Of course, it is impossible to calculate the sex of a child using this method.

There is also a table for determining the due date. You can also find it on the Internet. In addition to such tables, you can usually find tables for determining the sex of the child. They are usually also based on personal data (menstruation, ovulation). A special calculator will help you quickly calculate your cycle, and you will find out approximately when your baby will be born.

The easiest way to figure out when your baby is due is to go for a routine ultrasound. It is believed that this is the most reliable method. There, the calculation takes place based on the stage of fetal development.

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For many women, the feeling of an upcoming or already begun pregnancy occurs before the test shows two lines - that is, even before the actual delay. Scientists cannot yet give an explanation for these true premonitions, but the concept of Early Pregnancy Factor has already been introduced into the scientific lexicon, which describes the chemical reactions of the mother’s body in response to the accomplished conception after just a few hours. Currently, there are already tests for identifying the Early Factor hormone in the female body, but due to their significantly high cost, these tests are not produced on an industrial scale.

On average, birth occurs 10 obstetric months (280 days) after pregnancy, when the baby is ripe for birth. However, it should be noted that 280 days is the conditional number of days of bearing a child. All women's bodies are different, and all babies mature differently in their mother's tummy. Some will need 280 days, while others will be “already ready” in 240 days. Only 2% of newborns are born on a precisely calculated day. Most children are two weeks earlier, or several days later than the appointed time. The duration of pregnancy and childbirth is calculated based on the date of the start of the last menstruation.

If we take into account all the changes that occur with the baby almost every day during pregnancy, and especially the first trimester, then in general these processes in importance and complexity, in depth, can be compared with the birth of a new universe. Every day of the little baby inside you is not just a step, it is a huge leap, a breakthrough forward. The birth of a new life, despite the scale of achievements, does not require any external efforts... everything happens under the cover of secrecy. After all, the woman herself learns that conception has occurred only after some time. Thanks to modern technology, scientists have been able to study a little of the great mystery of birth - where EVERYTHING begins. Enter your data and flip through the pages of the calendar of human life development throughout pregnancy. Believe me, amazing discoveries await you!

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Calculation of due date

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Calculation of due date

Pregnancy is the most desired and long-awaited event for any woman. Therefore, it is not surprising that long before the documentary confirmation (two cherished lines on the test) of an “interesting” position, each of us already feels changes in the body.

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Select the date of conception to determine the due date online

How is this online test calculated?

After your gynecologist diagnoses pregnancy and determines the exact date of conception, only 280 days or 10 obstetric months will pass until the fetus fully matures. However, you should not strictly focus on these indicators. They are very individual and depend on the physiological characteristics of a particular woman and on the environment in which she carried the child. It is known from practice that only 4% of babies are born within 280 days. The rest, due to various factors, may be born earlier or later than expected. In order to find out the approximate date of birth of your baby and determine the so-called gestational age, they are guided by the first day of the last menstruation.

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Do you have any more questions? Read the answers below:

1. How accurate is the calculation based on the day of conception?

To understand the accuracy of the calculation, you need to decide on the calculation methodology. It's no secret that conception is possible only during the period of ovulation, during which a mature egg is released from the ovary. The duration of the menstrual cycle is an individual feature of each woman. On average it can range from 28 to 35 days.

Ovulation occurs in the very middle of the menstrual cycle. The exact date can be determined by ultrasound, using special home ovulation tests or by measuring basal temperature. Some women have special signs on this day by which she can determine that today is ovulation. It is on this day that conception occurs, which may not coincide with the day of physical intimacy, since sperm are able to maintain their viability in a woman’s body for a week.

Knowing the day of conception, also known as ovulation, it is quite easy to calculate the date of birth: you just need to add 266 days. This will be the expected date of birth. The accuracy of these calculations will directly depend on the accuracy of determining the date of ovulation. If your cycle is not constant and you are not sure of the date of conception, then this technique may cause some error.

2. How to calculate the due date using menstruation

This method of calculating the expected date of birth is used in antenatal clinics. It is also called obstetric term. To determine the expected date of birth, you need to know the date of the last menstruation. This day is the starting point for the calculation. If the duration of the menstrual cycle is 28 days, then you can use Naegele’s formula, according to which the date of birth is calculated as follows: three months are subtracted from the day of the last menstruation and seven days are added. You can also use another technique: 280 days are added to the date on which the first day of the last menstruation occurred. According to scientific data, this is the period necessary for the ripening of the fetus.

But if your cycle is longer or irregular, then calculating your due date based on your period will not be entirely correct. If the duration of the menstrual cycle exceeds 28 days, then childbirth will most likely occur later, if on the contrary, then earlier. If the cycle is not regular, then this method of determining the expected date of birth will be rather indicative and cannot be used as a basic technique.

3. How to calculate the due date based on the first movement

Often, to determine the expected date of birth, a landmark is used as the very first movement of the baby inside the abdomen, or more precisely, the moment when the mother was able to feel the movement of her baby. Therefore, it is also called intuitive and experts consider it inaccurate. Moreover, if a woman gives birth for the first time, she will most likely feel the first movement at the twentieth week of pregnancy. If a woman is about to give birth again, and she already knows what exactly she should feel, then the first movement of the fetus is in most cases felt at the eighteenth week. Now, in order to calculate the date of birth based on the first movement, if this is the first pregnancy, you need to count exactly 20 weeks from the date of the first movement. If another birth is imminent, then only 18 weeks need to be counted.

As practice shows, quite often many first-time mothers and women giving birth again begin to feel the movement of their baby already at 15-16 weeks. But there are also mothers who felt the first movement of their baby only at 21-22 weeks.

Do not rush to put this technique into practice to determine the expected date of birth, since in fact it is not known which category of expectant mothers you belong to.

4. How to calculate the due date using ultrasound

The most accurate method for determining the date of birth is considered to be diagnosis by ultrasound (ultrasound), but it must be used at very early stages, no later than the twelfth week. This method allows you to diagnose the gestational age with an accuracy of one day, thus indicating the approximate date of conception and, accordingly, the date of birth.

Later, the gestational age is determined by the size of the baby's head and limbs. But this conclusion does not allow us to accurately diagnose the expected date of birth, since each child develops completely individually, having a different weight not only at the time of birth, but also during its intrauterine development. Therefore, when determining the date of birth in the second trimester, an error of up to seven days appears, and an ultrasound examination in the third semester makes it difficult to judge the gestational age based on the intrauterine dimensions of the baby.

Thus, in order to accurately calculate the date of birth using ultrasound, it is necessary to undergo an examination during the first three months of pregnancy. Otherwise, the intrauterine dimensions of the child will not allow you to accurately determine the date of expected birth.