Mission Hospital has an award-winning staff that is leading the way in medical ingenuity. Our accomplishments have led to such awards as the Outstanding Achievement Award for the Commission on Cancer in 2008 – causing us to be one of 66 hospitals in the entire nation to be honored. Combining care for the mind, body and spirit, we take a unique approach to every individual patient.
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31872 Coast Highway
Laguna Beach, CA 92651
27700 Medical Center Road
Mission Viejo, CA 92691
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It is important to estimate your due date so you and your health care provider can schedule proper prenatal care and plan for your baby's birth. Your health care provider uses a method similar to this calculator to give you your due date.
Since your last menstrual period was on , your baby's estimated birth date is .
Franz Naegele, a German obstetrician, came up with the first due date calculations around 1850. He determined that the average length of pregnancy was about 38 weeks (266 days). This is about 40 weeks (280 days) after the first day of a pregnant woman’s last menstrual period. Naegele based his figures on an average menstrual cycle of 28 days, with ovulation on day 14 of the cycle. That meant the egg could not be fertilized until 2 weeks after the first day of the menstrual cycle. He used his data to come up with a calculation for due dates.
Today, most authorities agree that many factors affect a due date. Your health care provider can use ultrasound and other techniques to help estimate your due date.
This calculator is not intended to replace the evaluation of a health care professional.
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