Estimate your expected due date, current pregnancy week, trimester, and days remaining using LMP, conception date, or IVF transfer date.
Estimated Due DateMost pregnancies are dated as 40 weeks from the first day of the last menstrual period.
Pregnancy WeekShows your estimated gestational age based on today’s date.
Trimester GuideHelps identify whether you are in the first, second, or third trimester.
Calculate Your Due Date
Choose your calculation method and enter the relevant date.
Estimated Due Date
Medical note: This calculator gives an estimate only. Your doctor may adjust the due date based on ultrasound findings, cycle history, IVF details, or clinical assessment.
Pregnancy Due Date Calculator: How It Works, Accuracy & What to Expect
A Pregnancy Due Date Calculator helps estimate your baby’s expected delivery date based on important milestones like your last menstrual period (LMP), conception date, or IVF transfer date. While this tool gives a reliable estimate, it’s important to understand how due dates are calculated and what factors can influence them.
What Is a Pregnancy Due Date?
A pregnancy due date is the estimated day your baby is likely to be born, typically calculated as:
👉 40 weeks (280 days) from the first day of your last menstrual period (LMP)
This method is widely used because most women may not know the exact date of conception, but they usually remember their last period.
How This Due Date Calculator Works
This calculator uses three medically accepted methods:
1. Last Menstrual Period (LMP Method)
Adds 280 days (40 weeks) to your LMP
Adjusts for cycle length (important for irregular cycles)
Most commonly used in clinical practice
2. Conception Date Method
Adds 266 days (38 weeks) from conception
More accurate if ovulation or conception timing is known
3. IVF (In Vitro Fertilization) Method
Uses embryo transfer date
Adjusts based on embryo age (Day 3 or Day 5 transfer)
Most precise method when exact dates are known
How Accurate Is a Due Date?
A due date is an estimate, not a guarantee.
Only about 5% of babies are born exactly on their due date
Most deliveries occur between 37 and 42 weeks
Ultrasound (especially early pregnancy) provides the most accurate dating
Pregnancy Timeline Explained
Pregnancy is divided into three trimesters:
First Trimester (0–13 weeks)
Early development of organs
Common symptoms: nausea, fatigue, breast tenderness
Second Trimester (14–27 weeks)
Baby growth becomes noticeable
Reduced nausea, increased energy
Third Trimester (28–40 weeks)
Rapid weight gain of baby
Preparation for delivery
Why Your Due Date May Change
Your doctor may adjust your due date based on:
Early ultrasound measurements
Irregular menstrual cycles
Late ovulation
IVF or assisted reproduction
Fetal growth patterns
What If You Go Past Your Due Date?
Going past your due date is common.
Pregnancy is considered full-term at 39–40 weeks
Post-term is after 42 weeks
Doctors may monitor closely or induce labor if needed
Important Tips for a Healthy Pregnancy
✔ Attend regular antenatal checkups ✔ Take prenatal vitamins (folic acid, iron) ✔ Maintain a balanced diet ✔ Stay physically active (as advised) ✔ Monitor warning signs (bleeding, severe pain, reduced movements)
When to See a Doctor Immediately
Seek medical attention if you experience:
Vaginal bleeding
Severe abdominal pain
Persistent vomiting
Decreased baby movements
High blood pressure symptoms (headache, vision issues)
Key Takeaways
Due date = Estimated delivery date (EDD)
Most pregnancies last around 40 weeks
Calculator gives a useful estimate, not an exact date
Ultrasound remains the gold standard for accuracy
Frequently Asked Questions (FAQs)
Can my due date change?
Yes. It may change based on ultrasound findings or cycle irregularities.
Is it normal to deliver before or after the due date?
Yes. Most babies are born within a 2-week window before or after the due date.
Which method is most accurate?
IVF dating → most accurate
Early ultrasound → highly accurate
LMP → standard but less precise in irregular cycles
Final Note
This Pregnancy Due Date Calculator is designed for educational purposes only. Always consult your healthcare provider for personalized guidance and accurate pregnancy dating.
