Pregnancy Due Date

Calculate your estimated due date using Naegele's rule.

First Day of Last Menstrual Period (LMP)

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Estimated Due Date

Select LMP date

40 weeks from your last period

Important Note

This is an estimate. Only about 5% of babies are born on their exact due date.

Documentation

Naegele's Rule

Naegele's Rule was developed in the 1800s and remains the standard for estimating due dates.

The Formula

"LMP + 280 days = Estimated Due Date"

Trimester Breakdown

1st Trimester: Weeks 1-12

2nd Trimester: Weeks 13-26

3rd Trimester: Weeks 27-40