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EDD Calculation Formula:
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The Due Date Calculator With Date Of Conception estimates the expected delivery date (EDD) by adding 266 days to the known date of conception. This method provides an accurate prediction 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 birth, which corresponds to approximately 38 weeks of pregnancy.
Details: Accurate due date calculation is essential for prenatal care planning, monitoring fetal development, preparing for delivery, and scheduling important medical tests and appointments throughout pregnancy.
Tips: Enter the exact date of conception in the date field. The calculator will automatically compute the estimated due date by adding 266 days to the entered conception date.
Q1: Why 266 days specifically?
A: 266 days represents the average gestation period from conception to delivery, which equals approximately 38 weeks of pregnancy.
Q2: How accurate is this calculation 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 difference from the initial calculation.
Q5: What is considered full-term pregnancy?
A: A full-term pregnancy is between 37 weeks (259 days) and 42 weeks (294 days) from the date of conception.