1. What Is Pregnancy Due Date Calculator?

The Pregnancy Due Date Calculator estimates the expected delivery date based on the last menstrual period using Naegele's rule, which adds 280 days (40 weeks) to the first day of the last menstrual period.

2. How Does The Calculator Work?

The calculator uses the standard obstetric formula:

Where:

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

Explanation: This calculation assumes a regular 28-day menstrual cycle with ovulation occurring on day 14. The due date represents the end of 40 weeks gestation.

3. Importance Of Due Date Calculation

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

4. Using The Calculator

Tips: Enter the first day of your last menstrual period in the date field. 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 accurate for women with regular 28-day cycles. Only about 5% of babies are born exactly on their due date.

Q2: What If My Cycle Is Not 28 Days?
A: For irregular cycles, ultrasound dating in the first trimester provides more accurate due date estimation.

Q3: Can The Due Date Change During Pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, which are most accurate in the first trimester.

Q4: What Is The Normal Range For Delivery?
A: Full-term pregnancy is 37-42 weeks. Most deliveries occur between 38-41 weeks gestation.

Q5: Are There Other Methods To Calculate Due Date?
A: Yes, including conception date calculation, IVF transfer date, and fundal height measurement, but LMP remains the standard initial method.