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Free Pregnancy Due Date Calculator
Estimate your pregnancy due date using Naegele's rule, which adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). Also see your estimated conception window, how many weeks pregnant you are today, and which trimester you are in.
Frequently asked questions
How is a due date calculated?
The standard method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period. This assumes a 28-day cycle; adjust the cycle length for more accuracy.
What are the three trimesters of pregnancy?
The first trimester is weeks 1–12, the second trimester is weeks 13–26, and the third trimester is weeks 27–40. Each trimester has distinct developmental milestones.
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