Pregnancy Calculator
The pregnancy calculator estimates your due date and current pregnancy week based on your last menstrual period (LMP) or conception date. It uses Naegele's rule, which adds 280 days (40 weeks) to the first day of your LMP.
Track your trimester and see key milestones for each week of pregnancy.
How Is the Due Date Calculated?
Using Naegele's rule: Due date = LMP + 280 days. This assumes a 28-day cycle. For different cycle lengths, the calculator adjusts accordingly.
Pregnancy Trimesters
First trimester: weeks 1-12. Second trimester: weeks 13-27. Third trimester: weeks 28-40. Each trimester brings distinct developmental milestones.
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