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

About the Pregnancy Calculator

What it calculates

This pregnancy calculator estimates health and fitness metrics from your personal inputs. Calculate due date and track pregnancy milestones.

When to use it

Use for personal wellness tracking and education. Consult a healthcare provider for medical advice.

Example

Adjust the inputs above to model your specific scenario with the Pregnancy Calculator.

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