If you want to know how to calculate your due date, then here you will find answers to all your questions about this. You can calculate the due date based on the date of conception, as well as the last menstrual period. If you have access to the Internet, then you can calculate the moment of the birth of your child online completely free of charge.
If you don’t really trust the online calculator, you can calculate the approximate due date yourself, guided by special formulas. We will also talk about them in this article. The exact date of birth is difficult to calculate, since the child himself decides when to be born. So, let's talk about everything in order. How can the due date be calculated so that it exactly coincides with the birth of the child in the future?
Due date calculator
Determining the due date: What methods are there to determine the approximate due date?
So you took a pregnancy test and it came out positive. Now we calculate the moment the child is born. The date of birth is calculated differently. There are several ways. We will talk about all of them. Let's list first possible options calculating the approximate date of birth. Here they are:
- you can determine the date of birth both online and without the Internet by the date of conception;
- You can calculate your due date based on your last menstrual period.
Both of these methods can be used together. They don't exclude each other. The most the right option calculating and calculating the upcoming birth and gestational age in weeks, as well as the size of the fetus, is, of course, ultrasound diagnostics. With its help, gynecologists determine the most accurate moment of the birth of a child. He will also determine whether you can give birth yourself or whether you will need to do so. C-section if the size of the fetus is large or the baby is lying incorrectly. He will explain who assigns and pays a woman child care benefits during maternity leave (the employer or the Social Insurance Fund). But we will talk about those methods for determining the due date and gestational age for which you do not need to leave the house or even get up from your favorite sofa. After all, you can find out everything using the Internet.
How to calculate childbirth based on the date of conception?
To calculate the expected moment of birth of a baby by the date of conception and determine the gestational age in weeks, you need to have a regular menstrual cycle and know when ovulation occurred. After all, conception is possible only during ovulation. Well, we’re not even talking about the fact that you still need to remember the day on which you were intimate with your loved one. It's obvious. If, suppose, most women have menstruation for 28 days, then ovulation, as a rule, occurs on days 14-15.
But it is worth noting that conception of the fetus may not have occurred on the day of sexual intercourse. It has been noticed that sperm can live even 3 days, while “walking” inside a woman. Therefore, here the approximate moment of birth of the fetus based on the date of conception will be determined approximately, and not day by day. The error can be even one or two weeks. So, now you need to add 280 days to the day of conception (this is exactly how long pregnancy lasts on average for most women). So you will calculate and determine the due date by conception and the gestational age in weeks. It's quite simple if you have a regular menstrual cycle and good memory.
If you don’t want to bother yourself and want to immediately determine the day of your birth by conception and the gestational age in weeks, then use a special calculator on our website. Here you just need to enter the expected day of ovulation into the table and click the “Calculate” button. The computer will calculate and display the gestational age in weeks and the due date. As a result, you will know when the baby will appear and you will look forward to this day and will no longer look for the answer to the question “How can you determine the date of birth by conception?” This is a kind of fascinating fortune-telling that gives a correct prediction.
How to calculate the exact date of birth based on menstruation and find out what week of pregnancy you are in?
To make a calculation and find out the most accurate date of birth based on your period, that is, to find out when you will give birth, you should also have a regular menstrual cycle. The formula for calculating the moment of birth of a child based on the last menstruation of a pregnant woman is used in their practice by all gynecologists. They will certainly ask the expectant mother who came to see them about the first day of her last menstruation. There are probably no such pregnant women whose gynecologists were not interested in the first day of their last menstruation.
So, let’s calculate the approximate birthday of your child and find out how to determine the date of birth based on the last menstrual cycle (its first day). In order to start calculating the preliminary day of birth, you need to count three months ago from the first day of the last menstruation, and then add seven days. This is how the approximate day of birth of the child is obtained.
If you don’t want to count in your head, you can calculate the moment of the baby’s birth using an online calculator, which, after entering the data, will automatically give you the due date and what week you are in. To do this, simply enter the first day of the last menstrual cycle in a special calculator window, as well as the average duration of menstruation and the duration of the luteal phase (for most women it lasts two weeks, that is, 14 days). Next, click the “Calculate” button and wait for the results of the online test. Almost every woman used such a calculator. It is popular nowadays.
Now you know how to calculate your due date, a calculator will always help with this. And also, finding out the duration of your pregnancy in weeks and even days is now not a problem for you either. We hope that you will make the calculation correctly and without much difficulty and with great pleasure, and in the future you will make sure that the actual day of birth of the child coincides with the one given by the calculator! In the future, the question “How to determine the due date online” will not arise for you. Read about how to determine the due date by ultrasound and fetal movements, as well as how to bring the due date closer and get pregnant using IVF in other articles on our website.
If the delay in menstruation is small and there are no complaints about poor health, then rush to an appointment with antenatal clinic Not worth it yet. But your inner feeling already tells you that a miracle has happened and soon you will become happy parents wonderful baby. Any woman in this position strives to get an answer to the question: when exactly is the time for childbirth? Our service allows you to determine the exact date of birth of your unborn child in a matter of minutes.
Calculate due date online
Any method of calculating the date of expected birth is based on an idea of the normal duration of pregnancy, which usually lasts about forty weeks (in some cases, a deviation of several weeks is also not a pathology). The starting point is the beginning of the last menstrual period, and it is likely that the expected event will occur after exactly 280 days or 40 obstetric weeks.
Using the online calculator presented on the website, you can easily and simply find out the likely date of your upcoming birth. All that is required of you is to enter the necessary data into the appropriate windows of the calculator, and the necessary calculations are performed by the computer. The principle of the calculation is very simple: the date of the start of the last menstrual bleeding and the traditional 280 calendar days are summed up.
The date obtained is approximate, corresponding to the ideal medical indications. Actual times may vary slightly depending on individual characteristics the woman, her state of health and the general course of pregnancy.
Pregnancy calendar, how to calculate the due date using menstruation
Find the date of your last period in the blue line of the calendar. The date that is below it (red or yellow color) and will be the due date.
Calculate due date based on date of conception
Not every woman knows exactly the day when conception occurred, so doctors cannot reliably determine the so-called “embryonic” gestational age. However, if the time of fertilization is known, then the results of calculating the time of birth will be much more accurate, because each child needs the same period for a full-fledged birth. intrauterine development. In such cases, you need to add 280 days again, this time to the date of conception.
When calculating the date of birth based on the day of fertilization, minor errors are allowed, because pregnancy could have occurred on a different day than the corresponding sexual intercourse. Research shows that the conditions in the vagina are quite favorable for sperm, so they can stay here for several days before merging with the egg. The error ranges from one to three days, but no more. Thus, the date of conception determined by this method is also approximate.
Calculate due date based on ovulation
You can determine the date of birth of a baby by calculating the day of ovulation. This method is not suitable for everyone, because only insignificant amount women carefully monitor their menstrual cycle and, even more so, keep an ovulation calendar. If you know at least the approximate date of ovulation (with a constant cycle of 28 days, it falls in the middle), you can get a more or less accurate date of birth. To do this, you need to add 280 days to the ovulation date.
Of course, the most accurate results can be obtained if you have maximum number source data. The best option a combination of all the presented methods for calculating the date of birth is presented. But in any case, a few days of waiting is not a big problem, because the main thing is the birth healthy child and subsequent pleasant chores.
Video: How to determine the due date.
Having learned that the baby will appear in about 9 months, future mom seeks to find out the exact date of the joyful event. You want to meet the long-awaited new family member ready mentally and physically.
Gynecologists calculate the expected period of resolution of the burden different ways. Usually the baby is born between 38 and 42 weeks of pregnancy.. An examination by a doctor, ultrasound data, the date of ovulation - this is information that helps calculate the future “day X”.
The most calculation based on the beginning of the last menstrual cycle is considered simple and popular. This is a simple method by which the estimated date of birth (EDD) is determined. It is called the obstetric method. But like other calculations, it shows an approximate date.
Obstetric calculations serve as the basis for tests; based on them, a certificate of the beginning of maternity leave is issued, and the maximum allowance is calculated. They will help you find out your due date based on your last menstrual period.
It is easy to find out your due date from your last menstrual period. However according to statistics, only 4 women out of 100 give birth on time. For the rest, this figure fluctuates within 2 weeks in one direction or another.
Obstetric method for determining the date of birth
Using the obstetric method, the date is calculated from the beginning of the last menstrual cycle. Most suitable for women with regular periods.
Obstetric calculations serve as the basis for tests; based on them, a certificate of the beginning of maternity leave is issued, and the maximum allowance is calculated.
The PDR according to this method is found as follows:
- 3 months are subtracted from the start date of the last cycle;
- 7 days are added to the result;
- the resulting number is the desired PDR.
This date is very important initial stage pregnancy for the doctor and for the mother in labor. 
It allows the doctor:
- control the pregnancy process;
- monitor the development of the fetus and the health of the woman;
- prevent or notice pathological changes in time;
- determine the maturity of the fetus, taking into account the indications of ultrasound and other examinations;
- prepare the woman psychologically, choose a method of childbirth, taking into account the maturity of the fetus and the health of the expectant mother.
Knowing the due date helps a woman:
- find out the date of birth (based on the last menstrual period) at the very beginning of pregnancy and compare with your further sensations;
- adjust it with your doctor if necessary;
- receive a certificate on time maternity leave in the antenatal clinic;
- Discuss with the doctor the due date and obstetric care, based on medical indications.
Knowledge of the PDD helps the expectant mother to properly prepare for the upcoming important event, comply with the doctor’s requirements at every stage, which will improve the health of the woman and child.
How to determine the due date using Naegele's formula
The formula of Naegele, a famous German obstetrician, is used in the obstetric method for determining PDR.
Of course, each organism is individual, but there is an average obstetric duration of pregnancy. The basis is 280 days, based on the average static cycle length (28 days). This correlates with the phases of the moon, which is why pregnancy is said to last 10 lunar months.
Pay attention to doctors' advice
According to the formula, 9 months are added to the first day of the last menstruation, then another 7 days are added. With the obstetric method, the previous 3 months are subtracted and 7 days are added. This is the so-called inverse Naegele formula.
This simple formula will help you find out your due date based on your last period. A similar calculation of the MDR has been used in practice for many years, the error is up to 2 weeks, but additional examinations help to significantly reduce it.
Important to remember! Finding out the date of birth using data from your last menstrual period is very important. This must be done as early as possible so as not to give birth in inappropriate conditions (if the due date was determined incorrectly). The health of the mother and child, payments and the duration of maternity leave depend on this.
Online calculator to determine your due date
Such calculators help you quickly calculate the required date. They are built on the use of the same Naegele formula. By entering the required numbers in the required fields and clicking the mouse, you get the expected date. 
But for a more accurate result and the correct course of pregnancy, additional examinations are required that will help clarify the PDR.
Everything is convenient and fast. But for a more accurate result and the correct course of pregnancy, additional examinations are required that will help clarify the PDR.
How accurately can you calculate your due date?
Cycle duration and MRP are interconnected. The primary calculation is based on a cycle (28 days). With a longer, irregular or shorter cycle there will always be deviations. That's why the number that the doctor determines using this method is only the estimated date of onset of labor.
Test data, examinations by a gynecologist in consultation, and monitoring the course of pregnancy will help reduce the error.
Interesting fact! The date of birth of a child depends on various reasons; it can be changed by illness, stress, or expecting twins. If twins or triplets are born, then this happens ahead of schedule. In this case, gynecologists consider this to be the norm.
Other ways to find out your due date
Having calculated the PDR, the doctor will closely monitor the health of the expectant mother and fetus. The duration of pregnancy is largely determined by the individual characteristics of the mother and child. To take into account all factors and reduce the likelihood of error, the gynecologist constantly analyzes data from various studies. 
To find out the date of onset of labor, gynecologists use not only calculations based on the last menstruation, but also a number of other methods:
- ultrasonography;
- taking into account the first movement;
- embryonic calculation method (ovulation, day of conception);
- gynecological examination.
All these methods provide the doctor with additional information about the actual duration of pregnancy, fetal maturity, and readiness for childbirth.
All methods are not absolute. So, a woman giving birth for the first time will feel the movement of the fetus in the middle of the term. A woman who has already given birth will feel the movement of the fetus much earlier, because she expects it and listens to herself more carefully. Ovulation does not necessarily correspond to the day of conception, and the height of the uterine fundus is a rather individual indicator.
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However the totality of data allows the specialist to determine the onset of labor within 1-3 days. An ultrasound examination at 11-14 weeks is considered the most accurate.
Important to remember! All methods are not absolute. So, a woman giving birth for the first time will feel the movement of the fetus in the middle of the term. A woman who has already given birth will feel the movement of the fetus much earlier, because she expects it and listens to herself more carefully.
Note! The duration of the menstrual cycle has a direct impact on the due date. They are connected in direct proportion. In the case of a shorter cycle, labor will occur earlier than the calculated date. If the cycle is longer, then the event will occur later, although in both cases these will be healthy full-term children.
In order for the pregnancy to proceed without complications, the expectant mother should immediately register. A gynecologist will help a woman correctly determine the period and will accompany her at all stages of pregnancy. Knowing the due date will help a woman properly prepare for the birth of a baby and become a happy mother of a healthy child.
How to find out the gestational age, knowing the date of the last menstruation:
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.
Today: 18.03.2019
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 date of the start of your 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 that 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 prescribe any tests for this, he will simply measure
- uterus size , which will increase in size in accordance with 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
. 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., which 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. He will help you declassify the secret of your child’s birth date. first movement, which usually occurs at the 20th week (in first-time mothers) and at the 18th week during the second and subsequent pregnancies. In ancient times, when there was no ultrasound, this method of calculating the due date was almost the only one.
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 point is that only with the help ultrasound diagnostics the doctor can 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 others 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, is able to predict with high accuracy the date of the 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 activity
It is not uncommon for a pregnancy to be carried to term due to complications occurring 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 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.Calculating the expected date of birth (EDD) can be done in several ways, and each of them will only be indicative. Every gynecologist has a “favorite” method that he relies on. But the deviation of the due date from the calculated one is a variant of the norm.
The proposed method is on the first day of the last menstruation. Suitable for women with regular cycle lasting 28 days.
How to use the calculator
Just enter the date of the first day of your last period in the field - and click the button “Find out the due date”.
How else can you find out your gestational age and due date?
1. In the first trimester, you can find out the gestational age with high accuracy directly at an appointment with a gynecologist. He will determine the due date without any tests, simply by the size of the uterus. In the 2nd and 3rd trimesters this will no longer work.
To carry out calculations using this method, you need to add 280 days to the date of ovulation.
You can use the date of sexual intercourse as the initial data (just keep in mind that fertilization of the egg can occur on the 2nd or even 3rd day after it.
3. Hardware calculation of gestational age and date of birth using ultrasound. Using this method, the period can be determined with an accuracy of 1-3 days.
Using ultrasound, a specialist can observe the condition of the fetus, placenta, the position of the child’s head in relation to the entrance to the pelvis, the size of the opening of the cervix and other important parameters. That is why this method is highly accurate.
