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EDD Calculation Formula:
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The Pregnancy Due Date Calculator based on conception date estimates the expected delivery date (EDD) by adding 266 days to the known conception date. This method provides an accurate due date calculation when the exact conception date is known.
The calculator uses the simple 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 calculation is crucial for prenatal care planning, monitoring fetal development, scheduling important tests, and preparing for delivery. It helps healthcare providers track pregnancy progress and identify potential complications.
Tips: Enter the exact conception date in the date field. The calculator will automatically compute the estimated due date by adding 266 days. Ensure the conception date is accurate for the most reliable result.
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 calculation method?
A: When the exact conception date is known, this method is very 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 difference from the initial calculation.
Q5: What is considered full term?
A: Full term is between 39 weeks 0 days and 40 weeks 6 days. Babies born between 37 weeks 0 days and 38 weeks 6 days are considered early term.