Pregnancy dating ultrasound calculator

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.

So, you don't have a last period date to go on, or you're cycles are irregular enough to not know which end is up. But for those opposed to ultrasound (or for those just wanting that first pregnancy challenge) there is another way.

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If you have no idea when your last period was, your doctor may order an ultrasound to determine your due date.

Some women have cycles that are consistently longer than the average 28-day cycle.

On the flip side, if your due date is put too early and you are pressured to induce for whatever reason, you could wind with a preterm baby, which is no fun either.

The bottom line is this- it is worth it to you to put together all the clues you can about your own pregnancy and conception.

If you deliver on your due date, your baby is actually only 38 weeks old, not 40.

Please remember that your due date is only an estimate.

First of all, dating a pregnancy by ultrasound isn't perfect.

The farther along you are, the supposedly less accurate the dating of your baby is.

Measuring the baby using ultrasound is most accurate in early pregnancy. The best time to estimate gestational age using ultrasound is between the 8th and 18th weeks of pregnancy.

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.

A normal pregnancy can last anywhere between 38 and 42 weeks.

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