1. What Is Due Date Calculation?

The due date calculation estimates the expected delivery date based on the last missed period date. This method adds 280 days (40 weeks) to the first day of the last menstrual period to determine the estimated due date.

2. How Does The Calculator Work?

The calculator uses the standard obstetric formula:

Where:

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

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

3. Importance Of Due Date Calculation

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

4. Using The Calculator

Tips: Enter the date of your last missed menstrual period. The calculator will automatically add 280 days to provide your estimated due date. Ensure you enter the correct date for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: How Accurate Is This Calculation Method?
A: This method is approximately 80-90% accurate for women with regular menstrual cycles. Ultrasound dating in early pregnancy provides more precise estimation.

Q2: What If My Cycle Is Not 28 Days?
A: For irregular cycles, the calculation may need adjustment. Consult with your healthcare provider for personalized due date estimation.

Q3: Why 280 Days Specifically?
A: 280 days represents 40 weeks of gestation, calculated from the first day of the last menstrual period rather than conception date.

Q4: Can The Due Date Change?
A: Yes, healthcare providers may adjust the due date based on ultrasound measurements, especially if there's discrepancy with menstrual dating.

Q5: What Percentage Of Babies Are Born On Their Due Date?
A: Only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the estimated date.