Naegeles Rule Calculator

Naegeles Rule Calculator calculator can be used to estimate the expected due date of a pregnancy based on the first day of the last menstrual period (LMP).

Input Parameters

Calculation Results

Estimated Due Date

Where:
Naegeles Rule adds 7 days to the first day of the LMP and then adds 9 months.

Naegeles Rule Calculator Calculator Usage Guide

Learn how to use the Naegeles Rule Calculator calculator and its working principles

How to Use

  1. Enter the first day of your last menstrual period (LMP) in the date field.
  2. Click the "Calculate" button to get your estimated due date.
  3. Click "Reset" to clear all inputs and start over.

Understanding the Naegeles Rule

The Naegeles Rule is a simple method used to estimate the expected due date of a pregnancy. It's based on the following formula:

Due Date = LMP Date + 280 days (approximately 40 weeks)

This method adds 7 days to the first day of the LMP and then adds 9 months. For example, if your LMP was January 1, 2023, your estimated due date would be approximately August 7, 2023.

Limitations

The Naegeles Rule provides a rough estimate and should be used as a general guideline. For more accurate results, healthcare providers may use other methods such as ultrasound measurements during pregnancy.