Find your estimated due date and current week of pregnancy. Calculated using Naegele's Rule — the same method used by healthcare providers worldwide.
Naegele's Rule: Add 280 days (40 weeks) to the first day of your last menstrual period. Only about 5% of babies are born on their exact due date — most arrive within 2 weeks either side. Your healthcare provider will use ultrasound measurements to confirm or adjust your estimated due date.