Calculating your estimated due date (EDD) is one of the most exciting milestones in early pregnancy. Obstetricians standardly calculate pregnancy duration as 280 days (40 weeks) from the first day of your last menstrual period (LMP).
What is Naegele's Rule?
Naegele's Rule is the medical standard formula used by doctors:
Formula: First day of LMP + 1 Year - 3 Months + 7 Days (Adjusted for cycle length).
Calculate your estimated due date and key trimester scan dates: