1. What is Due Date Calculation?

The Due Date Calculator estimates the expected delivery date (EDD) based on the first day of the last menstrual period. This is the most common method used by healthcare providers to determine pregnancy due dates.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy calculation formula:

Where:

• \( EDD \) — Estimated Due Date
• \( Last\ Period \) — First day of last menstrual period
• \( 280\ days \) — Standard pregnancy duration (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The 280 days represents 40 weeks of pregnancy.

3. Importance of Due Date Calculation

Details: Accurate due date calculation is essential for proper prenatal care, monitoring fetal development, planning for delivery, and identifying potential pregnancy complications.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period. Ensure the date is accurate for the most reliable due date estimation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this due date calculation?
A: This method is about 80% accurate within ±2 weeks. Only about 5% of babies are born exactly on their due date.

Q2: What if my cycle is longer or shorter than 28 days?
A: For cycles longer than 28 days, add the extra days to the due date. For shorter cycles, subtract the difference.

Q3: When should I confirm with ultrasound?
A: Early ultrasound (8-12 weeks) provides the most accurate due date confirmation and should be used to adjust if there's significant discrepancy.

Q4: What is Naegele's rule?
A: This is the traditional method: Add 7 days to LMP date, then subtract 3 months. Both methods yield similar results.

Q5: Can due dates change during pregnancy?
A: Yes, healthcare providers may adjust due dates based on ultrasound measurements, especially if there's more than 5-7 days difference from LMP calculation.