Due Date Calculator
Find out when your little one is likely to arrive.
Your Estimated Due Date
First Trimester Ends
Second Trimester Ends
Full Term (37 wks)
How Is a Due Date Calculated?
Due dates use Naegele's rule: add 280 days (40 weeks) to the first day of your last period. Only about 5% of babies arrive on their exact due date — most come within two weeks before or after.
Factors That Affect Your Due Date
- Cycle length — longer cycles may mean a later due date
- First vs. subsequent pregnancies
- Maternal age and health conditions
- Multiple births (twins typically arrive earlier)