Prediction calculator pregnancy

Calculate your due date: How to find your baby's due date

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First day of my last period

BabyCenter's Due Date Calculator

Use our pregnancy due date calculator by plugging in either the date of your last menstrual cycle or the date you know you conceived. The calculator will do the rest.

How is my due date calculated?

There are several ways your due date is determined. If you happen to know the day you conceived, you can count 38 weeks from that day to find your due date. (Human gestation takes about 38 weeks.)

But very few expectant moms know exactly when they conceived. Even if you only had sex once during your fertile period, you wouldn't conceive on that day unless you happen to be ovulating. Sperm can live for up to five days inside your fallopian tubes. So, it could be up to five days after you have sex that you release an egg (ovulate) and it gets fertilized by a waiting sperm. That's the day you conceive.

So, without knowing the day of conception, how does anyone determine a due date?

First day of your last period

The most common way to calculate your pregnancy due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that's how most healthcare providers do it.

If your menstrual cycle length is the average length (28-day cycle), your menstrual cycle probably started about two weeks before you conceived. This explains why pregnancies are said to last 40 weeks instead of 38 weeks.

This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived. But generally speaking, women typically ovulate about two weeks after their menstrual cycle starts. And women are more likely to know when their last period started than the day they ovulated.

Conception date

If you do happen to know precisely when you conceived – say, if you were using an ovulation predictor kit or tracking your ovulation symptoms – you can calculate your pregnancy due date based on your conception date. Just choose that calculation method from the pulldown above and put in your date.

Note: Again, you don't necessarily conceive on the day you have sex.

IVF transfer date

If you conceived through IVF, you can calculate your due date using your IVF transfer date. If you had a Day 5 embryo transfer, count 261 days from your transfer date. If you had a Day 3 embryo transfer, count 263 days.

Can my due date change?

Your healthcare provider might revise your due date if your baby is measured during a first trimester ultrasound scan and found to be much bigger or smaller than expected for gestational age. This is more likely to happen if you have an irregular menstrual cycle length that makes it hard to pinpoint the date of conception.

Your healthcare provider will measure your baby during that ultrasound exam to figure out how far along your baby is and then provide you with a new due date.

What if I already know my due date?

If you already know your due date, you can use this calculator to see your pregnancy timeline. It will tell you when you'll hit various milestones, and when you may be due for prenatal tests and prenatal visits. You'll also find what your baby's sign and birthstone will probably be and which famous people were born on your due date.

How likely am I to give birth on my due date?

Of course, a due date calculation is always approximate, whether it's from our tool or from your doctor or midwife. Only 1 in 20 women delivers on their due date. You're just as likely to go into labor any day during the two weeks before or after.

Want more information about how the weeks, months, and trimesters of pregnancy are counted? See our pregnancy timing chart.

How soon can I take a pregnancy test?

With all this talk about pregnancy due dates, you may be wondering when you can take a pregnancy test. To ensure you get the most accurate reading, it's best to wait a few days after your missed period to take a pregnancy test.

At-home urine tests measure the amount of hCG (human Chorionic Gonadotropin) present in your body. If you take a pregnancy test before you miss your period, you may not get an accurate result, despite what some tests advertise.

If you're getting a blood test in your provider's office, you may get results sooner. These tests also measure the amount of hCG in your bloodstream, but they're more sensitive than at-home urine tests. Blood tests may be able to detect pregnancy six to eight days after ovulation.

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Ovulation calendar: How to calculate your most fertile days

This tool can help you learn about your menstrual cycle and determine your most fertile days of the month.

First day of your last period

mm-dd-yyyy

How long was your last cycle

How your fertile days are calculated

The Ovulation & Fertility Calculator estimates when you'll ovulate by counting back 14 days from the day you expect your next period. (If your cycle is 28 days long, your next period should start 28 days from the first day of your last period.)

Your fertile window includes the day you ovulate and the five days before, but keep in mind that you're much more likely to get pregnant during the last three days of this time frame.

See other ways to pinpoint your fertile days and increase your chances of becoming pregnant. Find out how to use an ovulation predictor kit, chart your basal body temperature, and pay attention to changes in cervical mucus.

Rise in basal body temperature
Cervical mucus is the texture of egg whites
Breast tenderness
Mild cramps or twinges in the abdomen
Very mild spotting
Heightened sense of smell
Increased sex drive
Changes in appetite or mood
Bloating

Tips for getting pregnant

Find out when you'll ovulate using our calculator or an ovulation predictor kit, or by tracking your symptoms.
Have sex every other day around the time of ovulation.
Start taking a prenatal vitamin with folic acid at least one month before you start trying (6 months is ideal).
See your healthcare provider and make sure they're managing any pre-existing health conditions you may have. Staying up-to-date with vaccinations and regular check-ups and testing can lower the risk of complications during pregnancy.
Take good care of yourself. You'll want to kick unhealthy habits like smoking and start incorporating regular exercise into your routine if you aren't exercising already. Eating a healthy, nutrient-dense diet can help, too.

Sources

BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies.

ACOG. 2019. Fertility awareness-based methods of family planning. American College of Obstetricians and Gynecologists. http://www.acog.org/Patients/FAQs/Fertility-Awareness-Based-Methods-of-Family-Planning [Accessed July 2022]

ACOG. 2020. Good Health Before Pregnancy: Pre-pregnancy Care https://www.acog.org/womens-health/faqs/good-health-before-pregnancy-prepregnancy-care [Accessed July 2022]

Baby gender calculator

On this page we present the most popular methods among the people. Of course, these methods are not based on serious scientific developments and do not give a 100% guarantee, so it makes sense to perceive such calculations more as entertainment.

The birth of a child is always a miracle. Whoever is born: a boy or a girl, for the parents it will be the most beloved person in the world. And yet, most potential mothers and fathers, planning the birth of a baby, would not refuse the opportunity to "program" the sex of the unborn child.

Calculation of the sex of the unborn child

Husband's Age

Age of the wife

Month of ConceptionJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember

Do you have children together? No Boy Girl Boy and girl Two boys Two girls

Does the spouse have siblings? NoBrotherSisterBrother and sisterTwo brothersTwo sisters

Intensity of sexual activity 1-2 times a week More often than 2 times a week Less than once a week

Your diet is dominated by Dairy products, vegetables and nuts Meat, mushrooms, potatoes, pickles Mixed diet

You are likely to have:

Chinese calendar

This calculator is based on the famous Chinese table and allows you to calculate the sex of the child by the date of conception and the woman's age. On our own behalf, we can add that the administration of the Nova Clinic website tested the effectiveness of the method by calculating the sex of children born in our center, and in most cases, oddly enough, received the correct answer from the calculator.

Enter the number of completed years between 18 and 55

Calculation of the sex of the unborn child

Mother's age18192021222324252627282930313233343536373839404142434445

Month of ConceptionJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember

Most likely you will have:

This technique, which appeared in the second half of the 20th century, is based on the assertion that spermatozoa carrying the male Y chromosome are more mobile, but less viable. At the same time, germ cells that carry the X chromosome move more slowly, but at the same time they can survive in the female body for a longer time. Thus, if sexual intercourse occurs at the time of ovulation, the probability of having a boy increases, if a girl is born a long time before it. In addition, the change in the vaginal environment plays a role, which gradually changes from alkaline to acidic (that is, more aggressive and harmful to spermatozoa with the Y chromosome).

It is believed that an active sexual life of spouses contributes to the conception of a son, and a more moderate one - to a daughter. We proceed from the fact that spermatozoa with a Y-chromosome are less tenacious. Thus, in the ejaculate of a man after prolonged abstinence, there is a greater number of spermatozoa with the X chromosome. In addition, rare sexual intercourse contributes to a decrease in sperm motility (which is why spermogram delivery requires some preparation, in particular, abstinence for no more than a week), which means that the chances that sperm carrying the X chromosome will be the first to reach the eggs increase even more.

French Diet

It was the experts from France, Jacques Laurent and Joseph Stolkowski, who came to the conclusion that the diet can have a direct impact on the likelihood of conceiving a female or male child. As a result of the research they have developed a special diet. According to this method, in order to conceive a girl, it is required to eat onions, eggplants, cucumbers, beets, carrots, green peas, capsicum, nuts and dairy products for at least 2 months before the alleged conception. Accordingly, those couples who dream of an heir should focus on meat dishes, mushrooms, potatoes and tropical fruits. In other words, in the first case, the body should receive a maximum of calcium and magnesium, in the second - sodium and potassium. According to unverified data, the effectiveness of this method is about eighty percent.

How to calculate the sex of the child "by the stars"? If you are planning the birth of a daughter, then at the time of conception, the Moon should be in any of the so-called female zodiac signs (Pisces, Taurus, Cancer, Virgo, Scorpio, Capricorn). Accordingly, if you dream of a son, wait until the Moon is in Aries, Gemini, Leo, Libra, Sagittarius or Aquarius.

If you believe the creators of this technique, then in the human body there is a cyclic renewal of blood, which has a direct impact on the sex of the unborn baby. Moreover, in men, the blood is updated every four years, and in women - once every three years. The calculation assumes that one of the parents, whose blood at the time of conception will be “younger”, will “transmit” their gender to the child. By the way, if a woman has a negative Rh factor, the result should be interpreted exactly the opposite. To find out the result, divide the age of a woman by 3, men - by 4. The authors also suggest taking into account the dates of serious blood loss (surgery, bleeding), and in this case, the countdown should be from this moment. It is logical to assume that sometimes the results of division may coincide. In this case, the authors state, you will have twins.

Medical methods

You can also determine the sex of the child using purely medical methods. However, these studies have nothing to do with forecasting and "programming". The most common and accurate is the determination of the sex of the child by ultrasound - after 20 weeks, in most cases, the doctor will be able to give you accurate information. Recently, a method is also gaining popularity that allows you to find out the sex of the child after the 7th week of pregnancy by analyzing the blood of a pregnant woman. The study is based on the fact that the mother's blood contains a small amount of fetal DNA, and if Y chromosomes are found, it can be argued that a boy is expected. During the IVF cycle, PGD can be performed - preimplantation genetic diagnosis. This method allows you to test embryos for the presence of certain chromosomal abnormalities and find out the sex of the unborn child. If there are sex-linked hereditary diseases in the family, embryos of only a certain gender are transferred into the uterine cavity. However, Russian law prohibits the choice of the sex of the child in the absence of medical indications.

Calculate the date of birth - online calculator for calculating the date of conception, by monthly

Pregnancy Calendar

Enter the first day of the last menstrual period

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Calculating the date of birth by the date of conception

Calculating the date of birth by the date of conception is not difficult at all.

On average, gestation (“interesting position”) in women lasts two hundred and eighty days from the moment ovulation.

280 days is ten obstetric months. Or forty obstetric weeks. Plus the first two obstetric weeks before ovulation from the first day of the last menstruation. At the same time, ovulation is fourteenth day of a woman's menstrual cycle. That is, knowing the date of the first day of the last menstruation, add fourteen days to it, and then add another two hundred and eighty days, and you get estimated date of delivery (ED). Spermatozoa can live up to three days. Therefore, for the point when we try to determine the date of birth from the date of conception, we are not taking the day of conception, or sexual intercourse, in which conception is most likely to occur. The starting point is the day ovulation.

Calculate the due date from the last menstrual period

In addition to the above method, you can calculate the due date from the monthly period. Need to know the first day last menstrual cycle.

Negele formula - subtract 3 months from the first day of the last menstruation and add 7 days.

Much depends on the menstrual period of the expectant mother. If it is less than twenty five days, the baby may be born a week or two earlier than the scheduled date. If the menstrual cycle is expectant mother for more than thirty days, childbirth may be delayed for a week or two. Overwearing such delay will not be considered. Two hundred and eighty days is just an average duration of pregnancy. However, every woman's body is different.

Calculate by ultrasound

There is another way to find out the due date. This can be done with ultrasonic research (ultrasound) of the fetus. This method is the most accurate and reliable regarding the calculation dates of birth according to the previous two methods. If an ultrasound is performed at the very end first trimester, the date of birth can be determined with an error of no more than three days. During the second and the third trimester of pregnancy, this method will not give such an accurate result.

After the first movement of the baby

Thus, you can see that there are several ways to calculate the due date:

From the day of ovulation;
From the first day of the last period;
Fetal ultrasound.

Now we will talk about another method. We determine the PDR by the first movement of the intrauterine child. Every expectant mother with such trepidation and impatience is waiting for the birth of her baby. Therefore, for It is very important for a pregnant woman to try to accurately calculate the expected date of birth. How is it do I know the date of the baby's first movement?

If a woman gives birth not at the fortieth week, but at the thirty-eighth, this will also be considered the norm.

This means that after the first movement during the first pregnancy, approximately twenty weeks, or five obstetric months. Having marked these twenty weeks on the calendar, you and get the estimated due date. To determine the date of the long-awaited meeting with the baby on the second or subsequent pregnancies, twenty-two weeks must be added to the date of the first stirring, because that in this case, gynecologists note the first movement, usually at the eighteenth week.

However, you should understand that this calculation gives an approximate due date. Error may be more than two weeks.

After obstetric examination

Before the twelfth obstetric week of pregnancy, every expectant mother must register with the women's consultation with your local gynecologist. Starting from the twentieth obstetric week of "interesting position "when visiting his gynecologist, the doctor measures the size of the abdomen, and also measures the height of the bottom uterus. These data are regularly entered into the exchange card. The doctor based on these indicators in dynamics can calculate the estimated date of birth of your Miracle. It should be noted that this will the approximate time. You can calculate the due date more accurately using our due date calculator. it a truly effective method with a minimum of deviations and errors in the calculations.

After examination by a gynecologist

A gynecologist during regular check-ups of a pregnant woman assesses the growth dynamics of the uterus. This organ increases in size along with the fetus. According to systematic examinations of the sizes uterus, an experienced and qualified gynecologist can predict the expected date of birth. AT This method is very important to monitor the health of a pregnant woman in the first trimester. bearing a child. Such a prognosis will be effective when monitoring a pregnant woman in the early terms. Based on the results of the examination in the second and third trimester, the prognosis of the PDD will have a greater error.

How accurate are the timing results?

The reality is that the duration of childbearing is individual for each woman.

To accurately calculate the date of delivery, you need to take into account many factors:

First pregnancy;
How long is this woman's menstrual cycle;
Single or multiple pregnancy;
Genetic features and much, much more.

Will the result of our calculator be considered absolutely accurate, the forecast of an experienced gynecologist, ultrasound data? No. The term is conditional. For the psychological peace of the future mothers.

If a woman gives birth not at the fortieth week, but at the thirty-eighth, this will also be considered the norm.

And even if the mother gives birth in the forty-second or forty-third week of pregnancy, this will also be the norm. Although many of the above methods for predicting the expected date of birth in their formula have the fact that the average pregnancy lasts two hundred and eighty days, that is forty weeks.

Prematurity may be caused by pregnancy and health conditions this particular expectant mother.

There are no standards here, forecasts are forecasts, but the reality may be different.

However, pregnant women who have calculated their due date are better able to organize their time "interesting position". Documents and a bag for the maternity hospital are ready in time. All completed on time examinations. Ready and renovated children's room. Completed courses for young mothers. Completely ready to breastfeeding.

Therefore, this is a very useful thing for both mom and baby!

Are deviations from the deadline normal?

Are deviations from the estimated due date normal? Of course they are. Only seventeen percent of women give birth on the predicted due date, while the remaining 83 percent give birth either earlier or later than the due date.

The maximum accuracy in the calculation of the date of delivery is not to be expected. It's only conditional reference point. The lighthouse, on which the frigate of a happy pregnancy and joyful motherhood is heading. Neither one specialist, no matter how outstanding his qualifications, is not able to take into account dozens of factors specific organisms of a woman and an intrauterine baby.