Pregnancy week calculator

The Due Date Calculator estimates the delivery date of a pregnant woman based on her last menstrual period (LMP), ultrasound, conception date, or IVF transfer date.

Estimation of 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.

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.¹

Due dates can be estimated using a number of different methods, including the last menstrual period, ultrasound, conception date, and IVF transfer date.

Last menstrual period

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.

Although there is some debate regarding when pregnancy technically begins, whether at fertilization of the egg (conception), or when the eg

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