Due Date Calculator
This due date estimator can tell you your expected due date. Due dates are calculated by adding 280 days (40 weeks) to the first day of your last menstrual period.
The first day of your last menstrual period is how most doctors estimate a mother’s due date. However, it is only an estimated due date—not a deadline for your baby’s arrival. Only 4 percent of babies are born on their estimated due date.
Your doctor will give you an official due date once you begin receiving prenatal care, but pregnancy calculators can give you a good estimation of when your baby is due.