Clinical tool

Pregnancy Due Date (Naegele's Rule)

Estimate your expected delivery date based on the first day of your last menstrual period.

Clinical Context

Naegele's Rule is the standard clinical method for estimating due dates. It assumes a 28-day cycle and calculates 280 days (40 weeks) from the start of your last period.

Pregnancy Due Date (Naegele's Rule)

First Day of Last Period

This tool provides estimates for educational purposes and is not a substitute for professional medical advice.

Medical Accuracy Notice

This tool provides estimates for educational purposes and is not a substitute for professional medical advice.