Due Date Calculator
Calculate your pregnancy due date using your last menstrual period, conception date, or ultrasound dating. Get accurate delivery timeline and track your pregnancy progress.
Due Date Calculator
Calculate Your Due Date
Enter your information and click calculate to see your estimated due date and pregnancy timeline.
How to Use the Due Date Calculator
- Choose Calculation Method: Select from Last Menstrual Period (LMP), Conception Date, or Ultrasound Dating
- Enter Required Information: Provide the date and additional details based on your chosen method
- LMP Method: Enter first day of last period and average cycle length (most common method)
- Conception Method: Enter the known or estimated conception date
- Ultrasound Method: Enter ultrasound date and gestational age from scan (most accurate)
- View Results: See your due date, current pregnancy stage, and delivery timeline
Understanding Due Date Calculations
Calculation Methods
Delivery Timeline
Related Pregnancy Tools
Frequently Asked Questions
How accurate are due date calculations?
Due dates are estimates. Only about 5% of babies are born on their exact due date. Most babies are born within 2 weeks before or after the calculated due date. Ultrasound dating in the first trimester is most accurate.
Which calculation method is most accurate?
Ultrasound dating, especially when done between 8-13 weeks, is considered the most accurate method. LMP dating assumes a 28-day cycle and may be less accurate for women with irregular cycles.
What if I have irregular cycles?
If you have irregular menstrual cycles, the LMP method may be less accurate. In this case, ultrasound dating or conception date (if known) would provide a more reliable estimate.
When is a baby considered full-term?
A baby is considered full-term between 39-40 weeks of pregnancy. Early term is 37-38 weeks, late term is 41 weeks, and post-term is 42+ weeks.
Can my due date change?
Yes, your healthcare provider may adjust your due date based on ultrasound measurements, especially if there's a significant difference (more than 7 days) from your LMP-based due date.