Pregnancy Due Date Calculator
Calculate your baby’s estimated delivery date with multiple methods
Calculate Your Due Date
Your Pregnancy Results
Estimated Due Date
Current Week
Days Pregnant
Current Trimester
Important Pregnancy Milestones
Understanding Pregnancy Due Date Calculations
Last Menstrual Period (LMP)
The most common method used by healthcare providers. Calculates due date based on the first day of your last menstrual period using Naegele’s rule (adding 280 days).
Conception Date
More accurate for those who know their exact conception date. Adds 266 days (38 weeks) to the conception date to estimate delivery.
IVF Transfer Date
Specifically designed for IVF pregnancies. Calculates based on embryo transfer date and embryo development stage (day 3, 5, or 6).
Ultrasound Scan
Uses ultrasound measurements to determine gestational age. Most accurate when performed in the first trimester (6-12 weeks).
Frequently Asked Questions
How accurate are due date calculations?
Due dates are estimates, not exact predictions. Only about 5% of babies are born on their exact due date. Most babies are born within two weeks before or after the estimated due date, which is considered full-term.
Which calculation method is most accurate?
Early ultrasound (before 12 weeks) is generally considered the most accurate method. LMP calculations work well for women with regular cycles. Conception date and IVF methods are highly accurate when the specific dates are known.
Can my due date change during pregnancy?
Yes, your healthcare provider may adjust your due date based on ultrasound measurements, especially if there’s a significant difference between different calculation methods or if early ultrasounds show different gestational age.
What if I have irregular periods?
If you have irregular periods, the LMP method may not be accurate. In this case, ultrasound dating or conception date (if known) would provide more reliable estimates. Consult with your healthcare provider for the best approach.
Important Medical Disclaimer
This pregnancy due date calculator is for informational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for accurate pregnancy dating and prenatal care. Due dates are estimates, and actual delivery dates can vary significantly.