Pregnancy Due Date Calculator (EDD)
Calculate estimated date of delivery, current gestational age, and your full ANC visit schedule based on Indian guidelines.
Calculating EDD for every pregnant patient? There's a better way.
EasyClinic auto-calculates EDD on patient registration, schedules all 4 PMSMA visits, and sends WhatsApp reminders to your patients automatically.
Also Known As
What is the Estimated Date of Delivery (EDD)?
The Estimated Date of Delivery (EDD), also known as the due date, is the predicted date when a baby is expected to be born — approximately 40 weeks (280 days) from the first day of the last menstrual period (LMP). The most widely-used method is Naegele's Rule: LMP + 7 days − 3 months + 1 year, which assumes a regular 28-day cycle with ovulation on day 14.
Only about 4-5% of babies are actually born on their EDD; most arrive within 2 weeks before or after. The EDD remains the cornerstone of obstetric care — guiding the timing of antenatal visits, screening tests, vaccinations, and delivery planning.
Antenatal Care (ANC) Schedule in India — PMSMA Guidelines
The Pradhan Mantri Surakshit Matritva Abhiyan (PMSMA), launched by the Government of India, mandates a minimum of 4 ANC visits for every pregnant woman, free of cost on the 9th of every month at all government health facilities. WHO recommends 8 contacts during pregnancy.
- 1st visit (≤12 weeks): Confirm pregnancy, blood group, Hb, urine, HIV/syphilis screen, TT-1
- 2nd visit (14-26 weeks): TT-2, USG anomaly scan at 18-20 weeks (TIFFA)
- 3rd visit (28-34 weeks): Growth scan, GTT, anti-D if Rh-negative
- 4th visit (36+ weeks): GBS, fetal position, delivery planning
Used Daily by Doctors Across India
This EDD calculator is essential for general practitioners, family physicians, gynecologists (OBGYN), midwives, ASHA workers, ANM nurses, and IVF specialists across India — from PHCs in rural Rajasthan to corporate hospitals in Bangalore, Mumbai, Delhi NCR, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, and Kochi.
Patients also use this calculator to track their own pregnancy progress, plan baby showers, prepare for maternity leave, and understand which trimester they're in. The tool supports irregular cycles by adjusting for cycle length variations from the standard 28 days.
Frequently Asked Questions
▸How accurate is the LMP-based due date?
For women with regular 28-day cycles and confident LMP recall, accuracy is ±5 days. For irregular cycles or uncertain LMP, ultrasound dating (especially CRL in 1st trimester) is more accurate — ±3-5 days when done before 13 weeks.
▸What if my menstrual cycle is not 28 days?
This calculator adjusts EDD based on your cycle length. For longer cycles (e.g., 32 days), ovulation occurs later, so the EDD is later. Enter your typical cycle length above for accuracy.
▸How is gestational age calculated?
Gestational age is measured from the first day of LMP, not conception. So at the time of conception (around day 14), you are technically already "2 weeks pregnant".
▸When is the anomaly scan (TIFFA) done?
The Targeted Imaging for Fetal Anomalies (TIFFA) ultrasound is typically done between 18-22 weeks of gestation in India.
▸What if my LMP is uncertain?
An early ultrasound (before 13 weeks) measuring crown-rump length (CRL) is the most accurate method to date the pregnancy. Discuss with your gynecologist.
▸Can the EDD change after the first ultrasound?
Yes — if the ultrasound EDD differs from the LMP-based EDD by more than 7 days in the first trimester, ultrasound dating is preferred and the due date is revised.
▸For IVF pregnancies, how is EDD calculated?
For IVF, EDD = embryo transfer date + 266 days (for day-3 transfer, add 263 days; for day-5 blastocyst, add 261 days). Most accurate due date method.
References
- WHO Recommendations on Antenatal Care (2016)
- Pradhan Mantri Surakshit Matritva Abhiyan (PMSMA) Guidelines, MoHFW Govt of India
- Naegele FK. Erfahrungen und Abhandlungen aus dem Gebiete der Geburtshülfe (1812)
Track every patient's pregnancy in EasyClinic
Auto-calculate EDD, schedule all ANC visits, send WhatsApp reminders, store USG reports — all in one secure, ABDM-compliant EMR.