Due Date Calculator

How Due Dates Are Calculated

Due dates are typically calculated using Naegele's Rule:

• From LMP: Add 280 days (40 weeks) to first day of last period
• From Conception: Add 266 days (38 weeks) to conception date
• Adjustments: May vary for irregular cycles or IVF pregnancies

Only about 5% of babies are born exactly on their due date!

Important Pregnancy Dates

• Week 12: End of first trimester, dating scan
• Week 20: Anatomy scan, halfway point
• Week 28: Third trimester begins, glucose test
• Week 36: Group B strep test, birth plan discussion
• Week 37-42: Full term window for delivery

Disclaimer: Always confirm due date with your healthcare provider.