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Pregnancy Due Date Calculator
Estimate your due date and track pregnancy week by week with fetal development info. Enter LMP or conception date, all computed in your browser.
HOW TO USE
- 1Pick whether to calculate from last period (LMP) or conception date.
- 2Choose the date with the date picker.
- 3Read the estimated due date, current week, trimester and days remaining in the results.
EXAMPLE
INPUT
LMP: January 1, 2025
OUTPUT
Due: October 8, 2025
FAQ
How accurate is the due date?
The due date is an estimate. Only about 5% of babies are born on their exact due date. Most births occur between 37 and 42 weeks.
What if I don't know my LMP?
If you know your conception date, select "Conception Date" and enter that instead. The calculator will compute the due date from conception + 266 days.
What are trimesters?
First trimester: weeks 1 to 12. Second trimester: weeks 13 to 27. Third trimester: weeks 28 to 40. Each has different milestones and symptoms.
How is fetal development determined?
The development info is based on typical week-by-week milestones from medical sources. Individual pregnancies vary.