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About This Tool
The Pregnancy Due Date Calculator helps estimate when your baby is expected to arrive. You can calculate from either your last menstrual period (LMP) date using Naegele's rule, or from a known conception date.
Naegele's rule adds 280 days (40 weeks) to the first day of your last menstrual period. If calculating from conception date, it adds 266 days (38 weeks). The calculator also shows your current gestational age and trimester.
Keep in mind that only about 5% of babies are born on their exact due date. Most births occur within two weeks before or after the estimated date. Regular prenatal checkups and ultrasounds provide more accurate dating as your pregnancy progresses.