🤰 Pregnancy Due Date Calculator
Calculate your estimated due date (EDD), current trimester & key milestones — free & instant
Quick Answer
Most pregnancies last 280 days (40 weeks) from the first day of your last menstrual period — a formula called Naegele's Rule. Only about 5% of babies arrive on their exact due date; 90% of healthy births happen between weeks 38–42. Your due date is confirmed and refined by your first trimester ultrasound, ideally before 14 weeks.
Enter the first day of your last menstrual period (LMP)
Most cycles are 21–35 days. Default is 28 days.
Enter your known conception date or IVF embryo transfer date
Trimester
—
Weeks Pregnant
—
Days Remaining
—
Conception Date
—
📅 Key Milestones
⚕️ Medical Disclaimer: This calculator provides an estimated due date based on Naegele's rule and is for informational purposes only. It is not a substitute for professional medical advice. Only about 5% of babies are born on the exact due date. Please consult a qualified OB-GYN or your doctor for accurate dating — especially after your first trimester ultrasound scan.
Frequently Asked Questions
How is the due date calculated?
Your estimated due date (EDD) is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is Naegele's rule, the standard used by OBGYNs and IAP-recommended doctors across India. If your cycle is not 28 days, our tool adjusts accordingly.
How accurate is this due date calculator?
This calculator uses Naegele's rule and is as accurate as the dates you enter. Only about 5% of babies arrive on the exact due date. Most babies are born between 38–42 weeks. Your doctor will give you a more precise date after your first ultrasound (ideally between 8–13 weeks).
What is a trimester in pregnancy?
A pregnancy is divided into three trimesters. First trimester: weeks 1–12 (organ formation). Second trimester: weeks 13–26 (rapid growth, you start showing). Third trimester: weeks 27–40 (baby gains weight, gets ready for birth).
Can I use this for IVF due dates?
Yes! Switch to the "From Conception Date" tab and enter your IVF egg retrieval or embryo transfer date. For a Day 3 transfer, add 3 days to the retrieval date. For a Day 5 transfer (blastocyst), add 5 days.
When should I see a doctor during pregnancy?
The IAP and government health guidelines recommend your first antenatal visit as soon as you confirm pregnancy — ideally before 12 weeks. After that, visits are typically monthly until 28 weeks, fortnightly until 36 weeks, then weekly until delivery.