When is your baby due?
This calculator estimates your due date using Naegele's rule: add 280 days (40 weeks) from the first day of your last menstrual period (LMP), or 266 days from conception. Only about 5% of babies are born on their exact due date — most arrive within 2 weeks before or after.
Disclaimer: This is an estimate only. Consult your healthcare provider for personalized medical advice.