1. What is the Pregnancy Due Date Calculator?

The Pregnancy Due Date Calculator estimates the expected birth date based on the last menstrual period (LMP). It uses the standard obstetric calculation of adding 280 days (40 weeks) to the first day of the last menstrual period.

2. How Does the Calculator Work?

The calculator uses the standard due date formula:

Where:

• \( EDD \) — Estimated Due Date
• \( LMP \) — Last Menstrual Period (first day)
• \( 280 \text{ days} \) — Standard pregnancy duration (40 weeks)

Explanation: This calculation is based on Naegele's rule, which assumes a 28-day menstrual cycle and ovulation occurring on day 14.

3. Importance of Due Date Calculation

Details: Accurate due date estimation is crucial 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 in the date field. The calculator will automatically compute your estimated due date based on the standard 280-day pregnancy duration.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this due date calculation?
A: This method provides an estimate. Only about 5% of women deliver on their exact due date. Most deliveries occur within 2 weeks before or after the estimated date.

Q2: What if my menstrual cycle is longer or shorter than 28 days?
A: For women with regular cycles different from 28 days, the due date may need adjustment. Consult your healthcare provider for personalized calculation.

Q3: Can ultrasound provide a more accurate due date?
A: Yes, early pregnancy ultrasound (especially first trimester) can provide a more accurate due date estimation than LMP-based calculation.

Q4: Why is pregnancy calculated from LMP rather than conception?
A: LMP is used because it's typically easier to recall than the exact conception date, and it provides a standardized method for healthcare providers.

Q5: What should I do if I don't remember my LMP?
A: If you're unsure of your LMP, consult your healthcare provider who can estimate your due date through physical examination and ultrasound.