⚠️ This calculator provides estimates only. Always consult your healthcare provider for prenatal care and accurate due date information.
Enter your information above
Understanding Pregnancy Due Dates
A typical pregnancy lasts about 40 weeks (280 days) from the first day of the last menstrual period (LMP) to the birth. However, only about 5% of babies are born on their exact due date.
How Due Dates Are Calculated
By LMP: Add 280 days (40 weeks) to the first day of your last period
By Conception: Add 266 days (38 weeks) to the conception date
Ultrasound: Healthcare providers often use ultrasound measurements for more accuracy early in pregnancy
Pregnancy Trimesters
First Trimester: Weeks 1-12
Major organs form, morning sickness common
Second Trimester: Weeks 13-26
Energy improves, gender often determinable
Third Trimester: Weeks 27-40
Baby grows rapidly, preparation for birth
Key Pregnancy Milestones
Week 12: End of first trimester, miscarriage risk drops significantly
Week 20: Anatomy scan, often when gender is revealed
Week 24: Viability - baby may survive with intensive care
Week 37: Full term begins - baby is now considered full term
Week 40: Estimated due date
Personal Example
When my daughter told me she was pregnant, I couldn't wait to know when the baby was coming. Using the due date calculator, I found out her baby was due right around my birthday—how special is that?