Calculate your estimated due date (EDD), current pregnancy week, trimester and key milestones from your last menstrual period.
Weeks 1–12
Most critical period of organ development. Common symptoms: morning sickness, fatigue, breast tenderness. First ultrasound scheduled.
Weeks 13–26
The "golden period" - morning sickness eases, energy returns. Baby movements felt (quickening). Anatomy scan at week 20.
Weeks 27–40
Rapid baby growth and weight gain. Backache and shortness of breath common. Hospital bag ready from week 36.
The estimated due date (EDD) is calculated using Naegele's Rule, a formula developed by German obstetrician Franz Karl Naegele in the early 19th century. It adds 280 days (40 weeks) to the first day of the Last Menstrual Period (LMP), reflecting the average human gestation period. Only about 5% of babies are born exactly on their due date, but the EDD serves as a critical anchor for scheduling prenatal care, scans (anomaly scan at 18-20 weeks, nuchal scan at 11-14 weeks), and hospital preparation. This calculator gives you an instant EDD along with key milestone weeks.
India's Pradhan Mantri Surakshit Matritva Abhiyan (PMSMA), launched in 2016, offers free antenatal checkups on the 9th of every month at government health facilities. The National Health Mission (NHM) targets at least 4 antenatal care visits per pregnancy - a standard aligned with WHO recommendations. India's maternal mortality ratio (MMR) has fallen from 254 per 100,000 live births in 2004-06 to 97 in 2018-20, according to the Sample Registration System, reflecting improvements in institutional delivery and prenatal awareness. Knowing your due date early allows timely registration at the nearest PHC or hospital and ensures access to these programmes.
The tool also highlights key pregnancy milestones: the end of the first trimester (12 weeks), anatomy scan window (18-22 weeks), glucose tolerance test (24-28 weeks), and Group B Strep test (35-37 weeks). Understanding these milestones helps expectant mothers in India plan hospital visits, maternity leave under the Maternity Benefit Act, 1961 (amended 2017 to 26 weeks), and delivery preferences.