The default for this calculator bases the calculation on a woman's last menstrual period (LMP), under the assumption that childbirth on average occurs at a gestational age (age of a pregnancy calculated from the woman's last menstrual period) of 280 days, or 40 weeks. 1ĭue dates can be estimated using a number of different methods, including the last menstrual period, ultrasound, conception date, and IVF transfer date. While the due date is often estimated as a single date, it can be helpful to consider a range of due dates, since only 4% of births occur on the estimated due date. The due date, also known as the estimated date of confinement, is an estimation of when a pregnant woman will deliver her baby. Related Pregnancy Calculator | Pregnancy Weight Gain Calculator Estimation of due date
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