Pregnancy Calculator
Calculate pregnancy due date, conception date, and week-by-week milestones. Track trimester progress, fetal development, and estimated delivery date from LMP or ultrasound.
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Enter Your Information
Select the first day of your last menstrual period
Typical cycle is 28 days (range: 21-35 days)
Your Pregnancy Timeline
Due Date
July 2, 2026
Current Week
Week 4 + 2 days
Current Trimester
1st Trimester
Days Pregnant
30
Days Remaining
250
Pregnancy Progress
10.7%
Estimated Conception Date
October 9, 2025
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Trimester Dates
First Trimester Ends
December 25, 2025
Second Trimester Ends
April 2, 2026
Third Trimester Ends (Due Date)
July 2, 2026
Pregnancy Milestones
Week 4
Positive pregnancy test possible
October 23, 2025
Week 8
Baby's heart begins beating
November 20, 2025
Week 12
End of first trimester
December 18, 2025
Week 16
You may start feeling baby move
January 15, 2026
Week 20
Halfway through pregnancy! Anatomy scan
February 12, 2026
Week 24
Baby is viable if born prematurely
March 12, 2026
Week 28
Third trimester begins
April 9, 2026
Week 32
Baby practices breathing
May 7, 2026
Week 36
Baby is considered early term
June 4, 2026
Week 37
Full term pregnancy begins
June 11, 2026
Week 40
Due date!
July 2, 2026
How the Pregnancy Calculator Works
This pregnancy calculator estimates your due date, current pregnancy week, trimester, and important milestones based on the first day of your last menstrual period (LMP). It uses the standard medical method of calculating pregnancy duration.
Standard Pregnancy Duration
- Total Duration: 280 days (40 weeks) from LMP
- Conception: Typically occurs ~14 days after LMP
- Actual Gestation: About 266 days from conception
- Full Term: 37-42 weeks
The Three Trimesters
- First Trimester (Weeks 1-13): Major organ development, highest risk of miscarriage, morning sickness common
- Second Trimester (Weeks 14-27): Rapid growth, baby movements felt, anatomy scan performed
- Third Trimester (Weeks 28-40): Final development, baby gains weight, preparation for birth
Key Milestones Explained
- Week 4: Home pregnancy tests become accurate
- Week 8: Baby's heartbeat detectable on ultrasound
- Week 12: End of first trimester, miscarriage risk decreases
- Week 20: Midpoint! Detailed anatomy scan
- Week 24: Baby reaches viability milestone
- Week 37: Baby is full term
Important Notes
- Only 5% of babies are born on their exact due date
- Most babies are born between 38-42 weeks
- Healthcare providers may adjust dates based on ultrasound measurements
- First trimester ultrasounds (7-13 weeks) provide the most accurate dating
- This calculator is for educational purposes only
- Always consult with your healthcare provider
Frequently Asked Questions
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