Due Date Calculator
Due Date 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.
Results
Estimated Date Range
Based on typical pregnancy duration of 37-42 weeks:
Pregnancy Progress
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.
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 of 280 days, or 40 weeks.
Ultrasound
Estimating due date based on ultrasound involves the use of soundwaves to look inside the body and compare the growth of the fetus to typical growth rates of babies around the world.
Conception Date
Using conception date to estimate due date is similar to using the last menstrual period. There is a difference of about two weeks between using these two methods.
In Vitro Fertilization (IVF)
When using in vitro fertilization, the estimation of the due date is generally more precise than calculating the due date based on natural conception, since the exact transfer date is known.