Pregnancy Due Date

Estimated delivery date from the last menstrual period.

Enter values

Last period (LMP)

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due date = LMP + 280 days (Naegele's rule)

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How is the due date estimated?+

Naegele's rule adds 280 days (40 weeks) to the first day of your last menstrual period. Only about 4% of babies arrive exactly on the due date.

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