1. What is Naegele's Rule?

Naegele's Rule is a standard method for estimating the due date of a pregnancy based on the first day of the last menstrual period (LMP). It assumes a 28-day menstrual cycle and ovulation occurring on day 14.

2. How Does the Calculator Work?

The calculator uses Naegele's Rule formula:

Where:

• \( EDD \) — Estimated Due Date
• \( LMP \) — First day of Last Menstrual Period

Explanation: The rule adds 7 days to the LMP, subtracts 3 months, and then adds 1 year to estimate the due date for a 40-week pregnancy.

3. Importance of EDD Calculation

Details: Accurate due date estimation is crucial for prenatal care planning, monitoring fetal development, and preparing for delivery. It helps healthcare providers schedule appropriate tests and monitor pregnancy progress.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the date field. The calculator will automatically compute your estimated due date using Naegele's Rule.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is Naegele's Rule?
A: Naegele's Rule provides a good estimate but may not be precise for all women, especially those with irregular menstrual cycles.

Q2: What if my cycle is longer than 28 days?
A: For cycles longer than 28 days, the due date may need adjustment. Consult with your healthcare provider for a more accurate estimation.

Q3: Can ultrasound change the estimated due date?
A: Yes, early ultrasound measurements can provide a more accurate due date, especially if there's uncertainty about the LMP.

Q4: Why add 7 days and subtract 3 months?
A: This adjustment accounts for the typical 40-week gestation period from the LMP, accounting for the time between menstruation and conception.

Q5: Is this calculator suitable for all pregnancies?
A: While Naegele's Rule is widely used, individual variations may require personalized assessment by healthcare professionals.