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Expected EDD Formula:
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The Expected Due Date Calculator Based On Conception Date calculates the estimated delivery date by adding 266 days to the known conception date. This method provides a precise due date estimation when the exact conception date is known.
The calculator uses the following formula:
Where:
Explanation: This calculation is based on the average human gestation period of 266 days from conception to birth, providing an accurate due date when the conception date is precisely known.
Details: Accurate due date calculation is essential 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 automatically compute the expected due date by adding 266 days to the provided conception date.
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. Conception typically occurs about 14 days after LMP.
Q2: How accurate is this calculation method?
A: When the exact conception date is known, this method is highly accurate. However, natural variations in gestation can result in delivery dates within two weeks before or after the calculated 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 by adding 280 days to the first day of your last 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 this calculator be used for IVF pregnancies?
A: Yes, this method is particularly accurate for IVF pregnancies where the conception date is precisely known.