The average length of a pregnancy is 40 weeks, or 280 days, from the first day of the last normal menstrual period. Calculating the due date, or expected date of delivery, for a pregnancy is quite simple, then, if you know that date.
Simply add nine months and seven days to the date (first day of the last normal menstrual period), and you've got your pregnancy due date.
In reality, though, few women give birth on their exact due date. About 80 percent of babies are born within ten days of the due date. That's a fairly large window, beginning ten days before the due date and extending out ten days after the due date. A pregnancy that occurs during this time period (between 38 and 42 weeks) is called full term.
http://health.howstuffworks.com/pregnancy-and-parenting/pregnancy/issues/10005-how-to-calculate-your-pregnancy-due-date.htm
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