Calculate Date of Birth with Pregnancy Calculator

Knowing the approximate date of birth can help you plan various preparation details to welcome your baby's birth. In addition to getting an estimated date of birth from a doctor, you can also estimate yourself using a pregnancy calculator.

Generally the pregnancy lasts 37-42 weeks or 280 days on average (40 weeks), calculated from the first day of the last menstrual period. The first day of the last menstrual period (HPHT) is the first day of the menstrual cycle. While ovulation about two weeks after this period. If in this period the sperm meets the egg cell until conception occurs, then that's when the pregnancy begins.

Calculate Date of Birth with Pregnancy Calculator

The calculation of gestational age in a matter of weeks generally includes two weeks since the HPHT. So if your fetus is four weeks old, then your pregnancy is calculated six weeks. To find an estimate of the formula Naegele formula and the formula parikh.

Naegele formula

The name of this formula comes from the name of the inventor, Franz Karl Naegele, a German obstetrician living in the 19th century. The day of birth estimates (HPL) is calculated on the first day of your last menstrual period (HPHT). The Naegele formula is as follows:

Calculator pregnancy doctor

The first formula is used if HPHT is in January to March. For example, your HPHT is January 21, 2018, then your estimated date of birth is:

Year: fixed 2018

Month: 1 + 9 = 10

Day: 21 + 7 = 28

Then your baby's estimated day of birth is October 28, 2018.

The second formula is used if HPHT is in April to December. So if your first day of menstruation is May 1, 2018 then your approximate date of birth is:

Year: 2018 + 1 = 2019

Month: 5-3 = 2

Day: 1 + 7 = 8

Then the day your baby's estimated birth is February 8, 2019.

The Parikh Format

Naegele formula above has a weakness. This formula can only be applied to women with a 28-day menstrual cycle. What about menstrual cycles of less than or more than 28 days? The answer is using the Parikh formula. The calculation is done by calculating the time of ovulation, ie the length of the menstrual cycle minus 14 days.

Calculator pregnancy doctor

For example, HPHT on January 1, 2018. If the menstrual cycle is 28 days, then after calculated by the Naegele formula, the HPL is 8 October 2018. But if the menstrual cycle turns out to be 35 days, then with the formula of Parikh, the date of delivery becomes: HPHT + 9 months + (35-21) days = October 15, 2018.

Is The result is Accurate?

HPHT is not always an appropriate benchmark to calculate the date of birth. However, other factors are more difficult to predict, such as the first day of ovulation or when the last sexual intercourse leads to pregnancy. While HPHT is the most memorable day and recorded by almost all women.

The calculation of formula or calculator is approximate. Very likely if the baby is born earlier than expected. In addition to these calculations, doctors use ultrasound examinations to support and confirm the results of calculations by the formula. From the results of ultrasound examination, can know the development of the fetus from time to time until the age to be born.

With the Naegele formula, only 4% of pregnant women give birth right to HPL. However, 90% of pregnant women will give birth within 3 weeks around the HPL that has been determined. It is perfectly normal for a woman to have two weeks, or two weeks later than expected.

Women are at risk of childbirth they do not know exactly when HPHT, obese, have a baby boy, have family members with a history of late labor, and have had a child with a delayed childbirth.

To verify the results of a pregnancy calculator, you should still consult your obstetrician directly. In addition to knowing when your baby is born, you can also consult about the ingredients, tips, or other things that may be felt during pregnancy.

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