Pregnancy Due Date Calculator | Pregnancy Week Calculator

Pregnancy Due Date Calculator
Pregnancy Due Date Calculator

How Pregnancy Due Date Calculator helps Determining the Date of Conception

Pregnancy Due Date Calculator | Pregnancy Week Calculator: Because the human egg is capable of fertilization for less than 12 to 24 hours after ovulation the date of ovulation could also be taken as being the date of conception.

However, ultrasound determination of the date of ovulation has an equivalent imprecision as does the ultrasound estimate of the fetal age and, therefore, particular date of conception cannot usually be determined like in vitro fertilization. Pregnancy Week Calculator basically helps to determine fatal age with ultrasound determination and various other factors.

In addition, although a lady is presumably to become pregnant if she has sex on the day of ovulation conception can also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to 5 days before ovulation [26,27]. Women should be properly examine for CBC Test ( For Delhi NCR and Chandigarh Only ) which helps to analyse Women and Fatal blood reports and prevents blood disease.

Pregnancy Due Date Calculator ( Pregnancy Week Calculator )  confirms Determining the Estimated maturity

Determining the Estimated maturity

The estimated maturity (EDD or EDC) is that the date that spontaneous onset of labor is predicted to occur.

The maturity could also be estimated by adding 280 days ( 9 months and seven days) to the primary day of the last menstrual period (LMP).

This is often the tactic employed by “pregnancy wheels”. The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles, which ovulation and conception occur on day 14 of the cycle Pregnancy Due Date Calculator


Use of the LMP to determine the maturity may overestimate the duration of the pregnancy and may be subject to a mistake of quite 2 weeks [5-7].

In cases where the date of conception is understood precisely, like with in vitro fertilization, the EDD is calculated by adding 266 days to the date of conception.

Ultrasound uses the dimensions of the fetus to work out the fetal age (the time elapsed since the primary day of the last menstrual period).

The accuracy of the ultrasound estimate of the fetal age varies consistent with the fetal age.

“Ultrasound measurement of the embryo or fetus within the trimester (up to and including 13 6/7 weeks of gestation) is that the most accurate method to determine or confirm gestational age [24]”

The Society of Obstetricians and Gynecologist of Canada recommends the earliest ultrasound with a crown-rump length like a minimum of 7 weeks (or 10 mm) should be wont to determine the fetal age [28].

The American College of Obstetricians and Gynecologists recommends that ultrasound-established dates should take preference over menstrual dates when the discrepancy between ultrasound dating and LMP is

Pregnancy Due Date Calculator

  • If LMP is Greater than 5 days before 9 0/7 weeks of gestation
  • LMP is Greater than 7 days from 9 0/7 weeks to fifteen 6/7 weeks
  • If LMP is Greater than 10 days from 16 0/7 weeks to 21 6/7 weeks
  • LMP Greater than 14 days from 22 0/7 weeks to 27 6/7 weeks
  • If LMP is Greater than 21 days after 28 0/7 weeks by LMP

“Because of the danger of redating a little fetus which will be growth restricted, management decisions supported third-trimester ultrasonography alone are especially problematic.

They have to be guided by careful consideration of the whole clinical picture and should require closer surveillance, including repeat ultrasonography to make sure appropriate interval growth.” [24].

Other Methods For Estimating the fetal age

Estimating the fetal age

Apart from Pregnancy Due Date Calculator, there are other methods to estimate fetal age using Pregnancy Week Calculator

Clinical Examination

A pelvic examination supported by good menstrual records within the trimester has been reported to be a reliable method for dating of pregnancy [9].

Doppler Ultrasonography

The fetal heart is often heard using Doppler ultrasound by 10 to 12 weeks in most patients [10]. The fetal age should, therefore, be a minimum of 10 to 12 weeks if the fetal heart tone is heard.

Human Chorionic Gonadotropin bioassay

Human chorionic gonadotropin first becomes detectable within the mother’s blood and urine between 6 and 14 days after fertilization (3 to 4 weeks gestational age) [11-13]. The fetal age would, therefore, be a minimum of 3 to 4 weeks at the time of a reliable hCG bioassay.


When a twin pregnancy is that the results of in vitro fertilization determination of fetal age should be made up of the date of embryo transfer. Otherwise “…to avoid missing a situation of early intrauterine growth restriction in one twin, most experts agree that the clinician may consider dating pregnancy using the larger fetus.” [22,23].

Observed fetal age at Delivery

The table below shows the typical age of infants delivered within us consistent with the number of fetuses being carried (plurality) [29]. Table of Pregnancy Week Calculation is given below which helps to analyse pregnancy due date.

  Singleton Twins Triplets Quadruplets Quintuplets and higher-order multiples
Average Gestational Age (weeks) 39 35 32 30 27

The earlier age at delivery of multiple gestations may be a reflection of the increased incidence of preterm labor and obstetric intervention for complications like preeclampsia, disorder, fetal growth restriction, and increased risk for stillbirth that happens because of the number of fetuses increases [30-33].

The tendency for multiple gestations to be delivered before singleton pregnancies shouldn’t be interpreted that multiples should be assigned an earlier estimated maturity.

A term pregnancy is taken into account to be 39 to 40 6/7 weeks no matter the amount fetuses being carried [34].

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