How is a Pregnancy Due Date Calculated?
Most healthcare providers estimate a due date based on **Naegele’s Rule**. This method assumes a standard pregnancy lasts 280 days (40 weeks) starting from the first day of your last menstrual period (LMP).
Since many cycles vary in length, our calculator adjusts for your specific cycle. While it is exciting to mark your calendar, remember that only about 4% of babies are born exactly on their due date. Most births occur within a two-week window before or after the estimated date. This tool is intended for informational purposes and should be followed up with a medical ultrasound for precise dating.