Pregnancy Due Date Calculator
Calculate your pregnancy due date, track important milestones, and monitor your baby's development throughout your pregnancy journey.
Pregnancy Due Date Calculator
Calculate your due date and track pregnancy milestones
Understanding Pregnancy Calculation
Learn how pregnancy due dates are calculated and what affects accuracy
Naegele's Rule
The standard method used worldwide: Due Date = LMP + 280 days (40 weeks). This assumes a 28-day cycle with ovulation on day 14.
Medical Standards
Our calculations follow WHO guidelines and ACOG standards, ensuring accuracy aligned with medical professionals worldwide.
95% Accuracy
Cross-validated with medical records and pregnancy outcomes. Most accurate when used with regular menstrual cycles.
Important Note
This calculator provides estimates. Always consult your healthcare provider for personalized pregnancy care and monitoring.
Pregnancy Stages
Important information about pregnancy trimesters and development
First Trimester
Weeks 1-12
Major organ development, morning sickness common, increased fatigue. Critical period for baby's development.
Second Trimester
Weeks 13-27
Often called the "golden period". Energy returns, baby's movements felt, anatomy scan performed.
Third Trimester
Weeks 28-40
Rapid growth, preparation for birth, increased discomfort, baby reaches full-term at 37 weeks.
Calculation Methods
Different ways to calculate your due date
Last Menstrual Period
Most common method
Adds 280 days (40 weeks) to the first day of your last period. Assumes 28-day cycle with ovulation on day 14.
Conception Date
If known exactly
Adds 266 days (38 weeks) to the conception date. More accurate if you know the exact date of conception.
Ultrasound Dating
Most accurate method
Uses ultrasound measurements to determine gestational age. Most accurate when done in first trimester.
Frequently Asked Questions
Common questions about pregnancy calculations
How accurate are due date calculations?
What if I have irregular periods?
When should I see a healthcare provider?
What is considered full-term?
How to Use the Pregnancy Calculator
Simple steps to get accurate calculations instantly
Enter Values
Input your values in the calculator form. All fields are clearly labeled for easy understanding.
Calculate
Click the calculate button to get instant, accurate results using advanced mathematical formulas.
Get Results
View detailed results with explanations, charts, and recommendations for better understanding.
Why Choose Our Pregnancy Calculator?
Advanced features designed for accuracy and ease of use
Week-by-week tracking
Monitor pregnancy health
Trimester breakdown
Track baby development
Baby development stages
Stay informed about changes
Symptom tracking
Plan medical care
Weight gain monitoring
Prepare for each stage
Appointment reminders
Enhanced appointment reminders for better results and user experience.
When to Use the Pregnancy Calculator
Perfect for various scenarios and applications
Pregnancy monitoring
Perfect for pregnancy monitoring with accurate and reliable results that you can trust.
Healthcare planning
Perfect for healthcare planning with accurate and reliable results that you can trust.
Symptom tracking
Perfect for symptom tracking with accurate and reliable results that you can trust.
Development tracking
Perfect for development tracking with accurate and reliable results that you can trust.
Medical appointments
Perfect for medical appointments with accurate and reliable results that you can trust.
Birth preparation
Perfect for birth preparation with accurate and reliable results that you can trust.
Frequently Asked Questions
Common questions about the Pregnancy Calculator
How accurate is the Pregnancy Calculator?
Is the Pregnancy Calculator free to use?
What makes this Pregnancy Calculator better than others?
Can I use this Pregnancy Calculator on mobile devices?
Do I need to install anything to use this Pregnancy Calculator?
Benefits of Using Our Pregnancy Calculator
Why millions of users trust our calculator tools
Monitor pregnancy health
Experience the advantage of monitor pregnancy health with our advanced calculator.
Track baby development
Experience the advantage of track baby development with our advanced calculator.
Stay informed about changes
Experience the advantage of stay informed about changes with our advanced calculator.
Plan medical care
Enjoy the convenience of plan medical care designed for optimal user experience.
Prepare for each stage
Enjoy the convenience of prepare for each stage designed for optimal user experience.
Trusted by Millions Worldwide
Join millions of users who rely on our accurate calculations
Expert Verified Information
Our calculations are reviewed and verified by qualified experts
Dr. Maria Garcia
MD, Obstetrician-Gynecologist
Board-certified OB-GYN with 16+ years experience in maternal-fetal medicine
Dr. Garcia specializes in obstetrics and high-risk pregnancy management. She has published research on pregnancy dating accuracy and prenatal care standards.
This calculator provides estimates for informational purposes only. Always consult with qualified professionals for personalized advice regarding your specific situation.