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Conception Date Calculation:
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The Conception Date Calculator estimates when conception likely occurred based on your estimated due date. It uses the standard calculation of subtracting 266 days from the due date to determine the probable conception date.
The calculator uses the simple formula:
Where:
Explanation: This calculation is based on the average human gestation period of 266 days from conception to delivery, or 280 days from the first day of the last menstrual period.
Details: Knowing your conception date helps in understanding fetal development timelines, determining accurate gestational age, and can be important for medical and personal record-keeping purposes.
Tips: Enter your estimated due date in the date field. The calculator will automatically compute and display your estimated conception date. Ensure you use the most accurate due date provided by your healthcare provider.
Q1: Why 266 days specifically?
A: 266 days represents the average time from conception to delivery. When calculated from the last menstrual period, it's typically 280 days (40 weeks).
Q2: How accurate is this calculation?
A: This provides an estimate. Actual conception dates can vary due to individual differences in gestation periods and ovulation timing.
Q3: What if I know my last menstrual period instead?
A: Conception typically occurs about 14 days after the first day of your last menstrual period in a regular 28-day cycle.
Q4: Can conception date determine paternity?
A: While it can help establish timing, conception date alone is not definitive for paternity determination and should be used in conjunction with other evidence.
Q5: Why might my calculated conception date differ from ultrasound dating?
A: Ultrasound dating is often more accurate as it measures fetal development directly, while this calculation provides a general estimate based on averages.