Pregnancy dating ultrasound calculator

A normal pregnancy can last anywhere between 38 and 42 weeks.If you want to, you can view a sample due date report.On average only 5% of births take place exactly on the estimated due date.Most are born within a week either side of the estimated due date.Use our Pregnancy Calculator to calculate these dates for you.If the mother has a regular period and knows the first day of her last menstrual period, gestational age can be calculated from this date.

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The most accurate way to determine gestational age is using the first day of the woman’s last menstrual period and confirming this gestational age with the measurement from an ultrasound exam.Here are some ideas to help you figure an accurate due date.Keep in mind that this often requires patience, because some of the “signs” aren't perceptible until a little later in pregnancy.Pregnancy lasts an average of 280 days (40 weeks) from the first day of your last menstrual period (LMP).The first day of your LMP is considered day 1 of pregnancy, even though you probably didn't conceive until about two weeks later (fetal development lags two weeks behind your pregnancy dates).