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PREGNANCY WEEK CALCULATOR
The estimated due date is the date that spontaneous onset of labour is expected to occur which can be checked using a pregnancy calculator. Pregnancy usually lasts from 37 to 42 weeks from day one of your last period.
You can use our pregnancy week calculator to get an estimation & book an appointment at Motherhood Hospitals in a few simple steps. Fill the required details in the due date calculator or reach out to us for experts’ help.
Now that you’ve confirmed you are pregnant, you will be curious to know by which date your baby will be delivered. Your doctor will make an assessment to give you an approximate due date, but you can do it yourself with a Pregnancy Week Calculator or a Due Date Calculator or a Pregnancy Days Calculator.
Before we go on, here’s some interesting information. A human egg can fertilize for only 12 to 24 hours after ovulation, so the date of ovulation usually is a reasonably good indicator to estimate the date of conception. Ultrasound, another way to determine the date of ovulation suggests only the gestational age, and hence is not considered perfect. In fact, an accurate date of conception is usually arrived at only in the case of IVF (In Vitro Fertilization).
Determining the Estimated Due Date
Estimated Due Date (EDD or EDC) is the date on which a non-induced delivery is expected to occur. You can calculate the approximate date by considering the first day of the Last Menstrual Period (LMP) and adding 280 days to this. With the pregnancy due date calculator, you will also be able to calculate the number of weeks and days you are into your pregnancy.
The accuracy of the estimation of EDD in this method depends on how accurately the mother can recall the day of intercourse, if she has regular 28-day cycles and ovulation, and conception occurs on the 14th day of the cycle. Assumption of LMP to arrive at the due date of pregnancy may result in an overestimation of the pregnancy duration to the tune of over 2 weeks.
Coming to ultrasound, this approach considers the size of the foetus to determine the gestational age (the time since the first day of LMP). The accuracy of such an estimate of the gestational age varies. Using ultrasound to measure the foetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to arrive at the gestational age.
In the case of Vitro Fertilization (IVF), the date of conception will be known accurately, and EDD can be calculated by adding 266 days to that date.
As you progress into your pregnancy, your baby grows every day and your body changes too. You can use the week-by-week pregnancy calculator to better assess the trimester of your pregnancy, developments and experiences you have and can expect to have. Happy pregnancy!
Using the due date calculator
How does the pregnancy due date calculator work?
- Add 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28-day cycle).
- Your menstrual period and ovulation are counted as the first two weeks of pregnancy. This is why a pregnancy ovulation calculator is helpful to pinpoint the exact ovulation cycle.
- If you deliver on your due date, your baby is actually only 38 weeks old, not 40.
How accurate is the due date calculator?
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The pregnancy due date calculator is used by working out the first day of your last period and approximately how many days your menstrual cycle lasts (the average cycle is 28 days). The tool will calculate 40 weeks from the first day of your last menstrual period.
Your due date is calculated from the end of your last period plus 40 weeks or 280 days. It is highly likely though, that your baby will not arrive on the exact due date, but a couple of weeks on either side of it.
Most pregnancies go on for about 40 weeks, so the best way to estimate your date of conception is to figure out when your last menstruation period was and then count 40 weeks or 280 days from that date.
The period of pregnancy usually lasts between 38 and 42 weeks. It can be tricky to calculate how far you are along in the pregnancy because your baby is 2 weeks younger than the pregnancy start date. This is referred to as ‘gestational age’.
The pregnancy due date calculator works by calculating the first day of your last period and approximately how many days your menstrual cycle is (the average cycle is 28 days). The tool will then calculate 40 weeks from the first day of your last menstrual period.