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Pregnancy Due Date Calculator - When Is My Baby Due?
Free pregnancy due date calculator. Find out when your baby is due based on your last period or conception date. See your current week and trimester.
Pregnancy Due Date Calculator
Find out when your baby is due
Your Due Date
Enter your values to see results
and click the "Calculate" button
What is a Due Date Calculator?
A pregnancy due date calculator estimates when your baby will be born. Most pregnancies last about 40 weeks (280 days) from the first day of the last menstrual period (LMP). Only about 5% of babies arrive exactly on their due date - most are born within 2 weeks before or after.
How to Use This Calculator
- Select your calculation method
- Enter the date (last period or conception)
- Adjust cycle length if not 28 days
- Click Calculate to see your due date
Due Date Calculation
Due Date = LMP + 280 days
Naegele's Rule: Add 280 days to the first day of your last period. For cycles other than 28 days, adjust accordingly.
Frequently Asked Questions
How accurate is the due date?
Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks before or after. Your doctor may adjust it based on ultrasound.
When do the trimesters start and end?
First trimester: Weeks 1-12. Second trimester: Weeks 13-26. Third trimester: Weeks 27-40.
What if my cycles are irregular?
Irregular cycles make LMP dating less accurate. Your doctor will likely use an early ultrasound to determine gestational age.
What is full term?
Early term: 37-38 weeks. Full term: 39-40 weeks. Late term: 41 weeks. Post-term: 42+ weeks.
Do first babies come late?
First babies are slightly more likely to arrive after their due date, but every pregnancy is different.
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