Pregnancy Due Date Calculator

About Pregnancy Due Date Calculation

Due date calculation estimates when your baby will be born based on standard 40-week (280-day) pregnancy duration.

Calculation Methods

• Last Menstrual Period (LMP): Most common method - uses first day of last period
• Conception Date: If you know when conception occurred
• Ultrasound Dating: Most accurate - uses ultrasound measurements

How to Use

1. Choose your preferred calculation method
2. Enter the required date(s) and information
3. For LMP method, also enter your average cycle length
4. Click Calculate to see your due date and pregnancy timeline

Understanding Your Results

• Due Date: Estimated delivery date (only 5% deliver on this exact date)
• Gestational Age: How far along you are in pregnancy
• Trimester: Which third of pregnancy you're in
• Milestones: Important developmental stages and appointments

Important Information

• Due dates are estimates - babies are considered full-term from 37-42 weeks
• Only about 5% of babies are born on their exact due date
• Most babies (90%) are born within 2 weeks of the due date
• Ultrasound dating is most accurate, especially in first trimester
• This calculator is for educational purposes - consult your healthcare provider

Pregnancy Trimesters

• First Trimester: Weeks 1-13 (organ development)
• Second Trimester: Weeks 14-27 (growth and movement)
• Third Trimester: Weeks 28-40 (final development and preparation for birth)

Try Sample Calculation

Click "Load Sample" to see a typical pregnancy calculation with example values.