Due Date Calculator
Calculate pregnancy due date and milestones
Pregnancy Information
Due Date Information
12/15/2025
Estimated Due Date
279 days to go
Current Progress0 weeks
Based on last menstrual period
Conception Date3/24/2025
Estimated date of conception
First Trimester Ends6/8/2025
Week 13
Second Trimester Ends9/6/2025
Week 26
Third Trimester Begins12/5/2025
Week 27 until birth
Pregnancy Timeline
Week 4
Implantation occurs
4/7/2025
Week 6
Heartbeat may be detected
4/21/2025
Week 8
All major organs forming
5/5/2025
Week 12
End of first trimester
6/2/2025
Week 16
May feel first movements
6/30/2025
Week 20
Anatomy scan ultrasound
7/28/2025
Week 24
Viability milestone
8/25/2025
Week 28
Third trimester begins
9/22/2025
Week 32
Baby's rapid growth period
10/20/2025
Week 36
Full term approaching
11/17/2025
Week 40
Expected delivery date
12/15/2025
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