Pregnancy Due Date Calculator
Calculate your estimated due date and track your pregnancy milestones
Enter the first day your last period started
Enter the date of conception (if known)
Normal range is 21-45 days. Default is 28 days.
Your Estimated Due Date
Pregnancy Progress
You are currently
weeks, days
days until due date
Conception Date
Estimated conception
First Trimester Ends
End of week 12
Second Trimester Ends
End of week 27
Pregnancy Milestones
Week •
Trimester Guide
| Trimester | Weeks | Key Developments |
|---|---|---|
| First Trimester | 1-12 | Major organs form, heartbeat begins |
| Second Trimester | 13-27 | Baby moves, gender identifiable |
| Third Trimester | 28-40 | Rapid growth, preparation for birth |
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About Pregnancy Due Date Calculator
The Pregnancy Due Date Calculator helps expectant parents estimate when their baby will arrive. Using medically-recognized calculation methods, this tool provides your estimated due date (EDD) along with key pregnancy milestones.
How Due Date is Calculated
Naegele's Rule
The most common method used by healthcare providers:
Formula: Due Date = LMP + 280 days (40 weeks)
This assumes:
- A 28-day menstrual cycle
- Ovulation occurs on day 14
- Pregnancy lasts 280 days from LMP
Source: Named after Franz Karl Naegele (1778-1851), German obstetrician
Conception Date Method
If you know your conception date:
Formula: Due Date = Conception Date + 266 days (38 weeks)
Pregnancy Trimesters
| Trimester | Weeks | Key Developments |
|---|---|---|
| First | 1-12 | Major organs form, heartbeat begins |
| Second | 13-27 | Baby moves, gender identifiable |
| Third | 28-40 | Rapid growth, preparation for birth |
Important Milestones
- Week 4-5: Pregnancy test positive
- Week 8-10: First prenatal visit recommended
- Week 10-13: First trimester screening
- Week 18-22: Anatomy ultrasound
- Week 24-28: Glucose screening
- Week 36+: Weekly checkups
Accuracy Considerations
- Only 4-5% of babies are born on their exact due date
- Normal delivery occurs 37-42 weeks
- Ultrasound dating in first trimester is most accurate
- Cycle length affects calculations
Factors Affecting Due Date
- Cycle Length: Longer/shorter cycles shift ovulation
- Irregular Periods: Makes LMP method less accurate
- IVF/Assisted Reproduction: Known conception date is most accurate
- First vs. Subsequent Pregnancies: Patterns may vary
Disclaimer: This calculator provides an estimate only. Your healthcare provider will confirm your due date using ultrasound and clinical assessment. Always consult with your doctor or midwife for personalized medical advice.
About the Calculation Methods
Naegele's Rule
Due Date = First day of LMP + 280 days (40 weeks)
Named after Franz Karl Naegele (1778-1851), German obstetrician
Conception Date Method
Due Date = Conception Date + 266 days (38 weeks)
More accurate if conception date is known precisely
💡 Important Notes
- Only 4-5% of babies are born on their exact due date
- Normal delivery occurs between 37-42 weeks
- First trimester ultrasound provides the most accurate dating
- This calculator is for estimation only - consult your healthcare provider