In this method, you add seven days to the first day of your last cycle and subtract three months. You can also use the Naegele’s rule to calculate due date. This is based on a 28-day menstrual cycle. Due date can be calculated by adding 280 days to the first day of your last period. The first day of your last period: Knowing the first day of your last menstrual cycle is helpful in arriving at your estimated date of delivery and to calculate your pregnancy weeks. The due date is usually calculated in a number of ways, such as:ġ.
Conception date calculator full#
Happy pregnancy!Ī full term pregnancy lasts for about 40 weeks or 280 days.
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. 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.Īs you progress into your pregnancy, your baby grows every day and your body changes too. 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. The accuracy of such an estimate of the gestational age varies. 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.Ĭoming 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 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 14 th day of the cycle.
With the pregnancy due date calculator, you will also be able to calculate the number of weeks and days you are into your pregnancy. You can calculate the approximate date by considering the first day of the Last Menstrual Period (LMP) and adding 280 days to this. Determining the Estimated Due DateĮstimated Due Date (EDD or EDC) is the date on which a non-induced delivery is expected to occur. In fact, an accurate date of conception is usually arrived at only in the case of IVF (In Vitro Fertilization). Ultrasound, another way to determine the date of ovulation suggests only the gestational age, and hence is not considered perfect. 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. If you have taken a pregnancy test because you missed your period and found out that it was positive or if you consulted your doctor for the same, the next step would be to know how far along you are in terms of total weeks of pregnancy.īefore we go on, here’s some interesting information. Finding out that you are pregnant brings a flood of emotions - excitement, apprehension, confusion and elation all at once.
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