Pregnancy and Due Date Calculator
Pregnancy due date is estimated by adding 40 weeks (280 days) to the approximate first day of your last menstrual period. Only 5% of women deliver their babies on their projected due date, so this date should be used as an estimate.
Pregnancy and Due Date Calculator
This assumes a woman ovulates and conceives exactly two weeks after the first day of her LMP and carries the baby for 38 weeks. The problem is, of course, that this is an estimate, and 40 weeks is only an average term of pregnancy.
A normal pregnancy can last anywhere between 38 and 42 weeks. Many obstetricians will use what is called "Naegle's Rule" to determine the approximate due date: Take the first day of your last period, and count back three months, then add seven days. For example, a LMP of January 1, 2009 would give you an approximate due date of October 8, 2009 (an even 40 weeks ahead).
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