Due Date Calculator
Calculate pregnancy due date and milestones
Pregnancy Information
Due Date Information
12/9/2026
Estimated Due Date
279 days to go
Current Progress0 weeks
Based on last menstrual period
Conception Date3/18/2026
Estimated date of conception
First Trimester Ends6/2/2026
Week 13
Second Trimester Ends8/31/2026
Week 26
Third Trimester Begins11/29/2026
Week 27 until birth
Pregnancy Timeline
Week 4
Implantation occurs
4/1/2026
Week 6
Heartbeat may be detected
4/15/2026
Week 8
All major organs forming
4/29/2026
Week 12
End of first trimester
5/27/2026
Week 16
May feel first movements
6/24/2026
Week 20
Anatomy scan ultrasound
7/22/2026
Week 24
Viability milestone
8/19/2026
Week 28
Third trimester begins
9/16/2026
Week 32
Baby's rapid growth period
10/14/2026
Week 36
Full term approaching
11/11/2026
Week 40
Expected delivery date
12/9/2026
Understanding Due Date Calculation
Naegele's Rule
The due date is calculated using Naegele's rule, which:
- • Adds 280 days to LMP
- • Adjusts for cycle length
- • Assumes 14-day ovulation
- • Estimates 40-week pregnancy
Important Notes
- • Only 5% deliver on due date
- • Normal range: 37-42 weeks
- • Regular prenatal care is vital
- • Dates may be adjusted by ultrasound
Pregnancy Stages
First Trimester
- • Weeks 1-13
- • Major organ development
- • Morning sickness common
- • Frequent prenatal visits
Second Trimester
- • Weeks 14-26
- • Baby movement felt
- • Gender can be determined
- • More energy typically
Third Trimester
- • Weeks 27-40
- • Rapid baby growth
- • More frequent check-ups
- • Birth preparation