The estimated due date (EDD or EDC) is the date that spontaneous onset of labor is expected to occur. The due date may be estimated by adding 280 days ( 9 months and 7 days) to the first day of the last menstrual period (LMP).

When would be the due date?

Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). Another way to do it is to subtract three months from the first day of your last period and add seven days.

What does whens your due date mean?

As soon as you announce you are pregnant, you're likely to hear, “When is your due date?” The truth is, you are very unlikely to have your baby on your due date. More precisely, the medical world often refers to it as EDD, the estimated date of delivery. Due dates are exactly that – an estimate.