Last menstrual period Due date calculator and Ultrasound expected delivery date calculator. Gestational age calculator. To be used by Gynecologists and Obstetricians, but so easy that pregnant womans can use it too.
When you start announcing your pregnancy, everyone will start asking what your due date is. While this date can help you plan your life around your birth, there is no precise way to tell for sure what day your baby will be born. Every pregnancy's due date carries a plus or minus two weeks. In fact, less than four percent of women actually deliver on their due dates.
Naegele's Rule is a standard way of calculating the due date for a pregnancy. The rule estimates the expected date of delivery (EDD) by adding one year, subtracting three months, and adding seven days to the first day of a woman's last menstrual period (LMP). The result is approximately 280 days (40 weeks) from the LMP.