1. What is Naegele's Rule?

Naegele's Rule is a standard method for estimating the due date of a pregnancy. It calculates the estimated delivery date by adding 280 days (40 weeks) to the first day of the last menstrual period (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 rule assumes a 28-day menstrual cycle with ovulation occurring on day 14, resulting in a 280-day (40-week) pregnancy duration.

3. Importance of Due Date Calculation

Details: Accurate due date estimation is crucial for prenatal care planning, monitoring fetal development, scheduling appropriate tests, 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: Naegele's Rule provides a general estimate. Actual delivery dates can vary by ±2 weeks from the calculated due date.

Q2: What if my menstrual cycle is longer or shorter than 28 days?
A: For women with irregular cycles, ultrasound dating in early pregnancy may provide a more accurate due date estimate.

Q3: Why is the calculation based on LMP rather than conception date?
A: LMP is typically easier to recall accurately than conception date, making it a more practical starting point for calculation.

Q4: Does this account for leap years?
A: Yes, the calculator automatically accounts for leap years and varying month lengths in the 280-day calculation.

Q5: Should I rely solely on this calculation for medical decisions?
A: This calculator provides an estimate. Always consult with healthcare providers for medical advice and confirm due dates through clinical assessment.