Pregnancy Due Date Calculator

Estimated Due Date

This estimate uses the common 280-day pregnancy dating rule.

Formula: estimated due date = first day of last period + 280 days.

Understanding Pregnancy Due Date

1. What This Calculator Measures

Due-date estimation commonly starts from the first day of the last menstrual period.

2. How the Calculation Works

The calculator adds 280 calendar days, which is the standard 40-week pregnancy estimate.

3. Formula or Rule Used

estimated due date = LMP date + 280 days.

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