Find your estimated delivery date and current gestational age.
EDD = LMP + 280 days (40 weeks). Adjusted for cycle length: add (cycle − 28) days. Only 5% of babies are born on their due date; 80% are born within 2 weeks. First trimester ultrasound dating is more accurate than LMP. The three trimesters: 1st (weeks 1–12), 2nd (13–26), 3rd (27–40).