Due Date Calculator

Calculate your pregnancy due date and key milestones.

Free
Details
Result
Due date
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Current weekโ€”
Trimesterโ€”
Conception estimateโ€”
End of 1st trimesterโ€”
End of 2nd trimesterโ€”

Naegele's rule calculates due date as LMP + 280 days (40 weeks). Only about 5% of babies are born on their exact due date โ€” most arrive within 2 weeks either side. The calculator adjusts for non-28-day cycles by adding the difference from 28.