Due Date Calculator
Calculate your pregnancy due date and key milestones.
Details
Result
Due date
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Current week—
Trimester—
Conception estimate—
End of 1st trimester—
End of 2nd trimester—
Naegele's rule calculates due date as LMP + 280 days (40 weeks). Only about 5% of babies are born on their exact due date — most arrive within 2 weeks either side. The calculator adjusts for non-28-day cycles by adding the difference from 28.