1. What is Naegele's Rule?

Naegele's Rule is a standard method used by healthcare providers to estimate the due date of a pregnancy. It assumes a 280-day gestation period from the first day of the last menstrual period.

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
• \( 280 \) — Standard gestation period in days

Explanation: This calculation adds 280 days (40 weeks) to the first day of your last menstrual period, which is the standard method used in obstetric practice.

3. Importance of Due Date Calculation

Details: Accurate due date estimation is crucial for monitoring fetal development, scheduling prenatal tests, preparing for delivery, and identifying potential preterm or post-term pregnancies.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the date field. The calculator will provide the estimated due date based on the standard 280-day pregnancy duration.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is Naegele's Rule?
A: Naegele's Rule provides a good estimate, but only about 5% of women deliver exactly on their due date. Most deliveries occur within two weeks before or after the estimated date.

Q2: What if my cycle is not 28 days?
A: For women with regular cycles longer or shorter than 28 days, adjustments may be needed. Consult your healthcare provider for personalized calculation.

Q3: How is this different from conception date?
A: Pregnancy dating starts from LMP, which is typically about two weeks before actual conception occurs.

Q4: When should I confirm with ultrasound?
A: Early ultrasound (8-12 weeks) can provide more accurate dating, especially if LMP is uncertain or cycles are irregular.

Q5: Can due dates change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements or if fetal growth doesn't match the initial estimate.