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 280-day gestation period from the LMP.

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 calculation adds 280 days (40 weeks) to the first day of the last menstrual period to estimate the due date.

3. Importance of EDD Calculation

Details: Accurate due date estimation is crucial for prenatal care planning, monitoring fetal development, and preparing for delivery.

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.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is Naegele's Rule?
A: While widely used, it's an estimation. Actual delivery dates may vary by ±2 weeks from the calculated due date.

Q2: What if I don't know my LMP?
A: An ultrasound examination can provide a more accurate due date estimation if LMP is unknown or irregular.

Q3: Does this work for all menstrual cycle lengths?
A: Naegele's Rule assumes a 28-day cycle. Adjustments may be needed for significantly longer or shorter cycles.

Q4: What's the difference between gestational age and fetal age?
A: Gestational age is calculated from LMP, while fetal age is calculated from conception, typically 2 weeks less.

Q5: Should I rely solely on this calculation?
A: This is a helpful tool, but always consult with healthcare providers for accurate pregnancy dating and prenatal care.