In terms of gestational age, pregnancies typically last between 37 and 42 weeks, with 40 weeks often being used as an estimate in calculations. Although there is some debate regarding when pregnancy technically begins, whether at fertilization of the egg (conception), or when the egg adheres to the uterus (implantation), gestational age does not vary based on different definitions of pregnancy since it is based on LMP.
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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