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EDD Conception = Conception Date + 266 days
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The Pregnancy Calculator And Conception Date tool calculates the estimated due date (EDD) based on the known conception date. This method is particularly useful when the exact date of conception is known, providing a more accurate due date prediction.
The calculator uses the standard pregnancy calculation formula:
Where:
Explanation: The calculation adds 266 days (38 weeks) to the conception date, which represents the average human gestation period from conception to delivery.
Details: Accurate due date calculation is crucial for proper prenatal care, monitoring fetal development, planning for delivery, and ensuring both maternal and fetal health throughout pregnancy.
Tips: Enter the exact conception date in the date picker. The calculator will provide the estimated due date and current pregnancy duration in weeks and days.
Q1: Why 266 days instead of 280 days?
A: 280 days is calculated from the first day of the last menstrual period (LMP), while 266 days is from the actual conception date, accounting for the typical 2-week difference.
Q2: How accurate is this calculation method?
A: When the exact conception date is known, this method is highly accurate. However, actual delivery dates can vary by ±2 weeks from the calculated due date.
Q3: What if I don't know my exact conception date?
A: If the conception date is unknown, use the LMP-based calculation method which adds 280 days to the first day of your last menstrual period.
Q4: Does this account for leap years?
A: Yes, the calculator automatically accounts for leap years and varying month lengths in the date calculation.
Q5: Can I use this for IVF pregnancies?
A: Yes, this method is particularly useful for IVF pregnancies where the conception date is precisely known from the embryo transfer date.