Enter the first day of your last period or your conception date and instantly get your expected delivery date, trimester timeline, and key milestones.
Most OB-GYNs use this to calculate your EDD (Expected Date of Delivery)
Approximate dates — confirm with your doctor
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Download Aayi.ai Free →Your EDD is calculated by adding 280 days (40 weeks) to the first day of your LMP. This is Naegele's rule — the same method your OB-GYN uses. If your cycle is shorter or longer than 28 days, the calculation adjusts accordingly.
Doctors confirm dating with your first trimester ultrasound (dating scan, ideally done before 12 weeks). The ultrasound measures the baby's CRL (Crown-Rump Length) and may adjust your due date by a few days. Always trust your doctor's ultrasound-confirmed date over any calculator.
Full term is 37 weeks 0 days to 41 weeks 6 days. Before 37 weeks is preterm. 37–38 weeks 6 days is early term. 39–40 weeks 6 days is full term. 41–41 weeks 6 days is late term. 42 weeks+ is post-term. The healthiest window for delivery is 39–40 weeks.
Yes. The Naegele formula used here is the standard method across all FOGSI (Federation of Obstetric and Gynaecological Societies of India) guidelines. It is the same formula used in government hospitals and private clinics across India.
The dating scan should be done between 8–12 weeks of pregnancy. Combined with blood tests (NT scan + dual marker), it screens for chromosomal conditions and confirms your EDD. Your OB-GYN will schedule this at your first appointment. Do not wait beyond 14 weeks for your first scan.
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