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EDD Calculation Formula:
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The Estimated Due Date (EDD) by date of conception calculates the expected delivery date by adding 266 days to the known date of conception. This method provides an accurate estimation when the conception date is precisely known.
The calculator uses the following formula:
Where:
Explanation: This calculation assumes a standard 266-day gestation period from conception to delivery, which corresponds to approximately 38 weeks of pregnancy.
Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, planning for delivery, and ensuring optimal maternal and fetal health outcomes throughout pregnancy.
Tips: Enter the exact date of conception in the date field. Ensure the date is accurate for the most precise due date calculation. The calculator will automatically compute the estimated due date 266 days later.
Q1: Why 266 days specifically?
A: 266 days represents the average gestation period from conception to delivery, which equals 38 weeks of pregnancy.
Q2: How accurate is this method?
A: When the exact conception date is known, this method is highly accurate. However, only about 5% of babies are born exactly on their due date.
Q3: What if I don't know my exact conception date?
A: If the conception date is unknown, use the last menstrual period (LMP) method which adds 280 days (40 weeks) to the first day of your last period.
Q4: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on ultrasound measurements, especially if there's a significant discrepancy from the initial calculation.
Q5: What is considered full term?
A: Full term is between 37 weeks and 41 weeks, 6 days. Babies born during this period have the best health outcomes.