1. What Is The Pregnancy Due Date Calculator?

The Pregnancy Due Date Calculator estimates the expected delivery date (EDD) based on the last menstrual period (LMP) 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
• \( Last Menstrual Period \) — 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 due date represents the end of 40 weeks of gestation.

3. Importance Of Due Date Calculation

Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, scheduling important tests, and preparing for delivery. It helps healthcare providers track pregnancy progress and identify potential 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. 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 This Due Date Calculation?
A: This method is accurate for women with regular 28-day cycles. Only about 5% of women deliver exactly on their due date, with most delivering within 2 weeks before or after.

Q2: What If My Cycle Is Not 28 Days?
A: For women with longer or irregular cycles, the due date may need adjustment. An early ultrasound provides more accurate dating in these cases.

Q3: Why 280 Days Instead Of 9 Months?
A: Pregnancy is calculated as 40 weeks from LMP, which equals 280 days. This differs from calendar months due to varying month lengths.

Q4: 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.

Q5: What Other Methods Can Calculate Due Date?
A: Other methods include ultrasound dating, conception date calculation (LMP + 14 days + 266 days), and IVF transfer date calculation.