To tell you when your baby is due, your doctor will use a pregnancy due date calculator. Of course, your doctor will be the best authority to tell you when your baby is due; but you can use an online pregnancy calculator to find out the tentative date of arrival of your baby. This is a tool that uses the following information to calculate the pregnancy due date.

*You would need to know the first day of your last menstrual period

*You can get accurate results if you know your body’s cycle.

Pregnancy due date calculators can be surprisingly accurate. The pregnanc y usually lasts 266 days. You only have to add 280 days to the date on which you had your last period to figure out your estimated date of delivery. But even though you do the research, your doctor will have the last word on confirming the due date.

Many doctors use the pregnanc y due date calculator even before an ultrasound test. There is one more way to use the pregnancy due date calculator. Since a pregnancy is expected to last for 40 weeks from first day of your last menstrual period, or 38 weeks from the date on which you conceived, this is all the information you need to get an estimate of your due date with a pregnancy due date calculator, especially if you are the sort who has a regular menstrual cycle.

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