Pregnancy Due Date Calculator

Estimate your due date and how far along you are from your last period.

First Day of Last Menstrual Period

Average Cycle Length (days)

Estimated Due Date

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How far along	—
Trimester	—

How the due date is estimated

The common method (Naegele's rule) adds 280 days (40 weeks) to the first day of your last menstrual period, adjusted for cycle length. Only about 1 in 20 babies arrive exactly on the due date — it's an estimate. Always confirm with your healthcare provider.