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Conception Date Formula:
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The Date Of Conception Calculator estimates the conception date based on the estimated due date (EDD). It uses the standard calculation of subtracting 266 days from the due date to determine when conception likely occurred.
The calculator uses the conception date formula:
Where:
Explanation: This calculation is based on the average pregnancy duration of 280 days (40 weeks) from the first day of the last menstrual period, minus 14 days to account for the typical time between menstrual period and conception.
Details: Knowing the conception date helps in understanding fetal development timelines, estimating gestational age, and providing valuable information for prenatal care and planning.
Tips: Enter your estimated due date in the date field. The calculator will automatically compute and display the estimated conception date. Ensure the due date is accurate for the most reliable results.
Q1: Why subtract 266 days specifically?
A: 266 days represents the typical time from conception to due date, based on a 280-day pregnancy from the last menstrual period minus the 14-day follicular phase.
Q2: How accurate is this calculation?
A: This provides an estimate. Actual conception dates can vary due to individual differences in menstrual cycle length and ovulation timing.
Q3: Can I use this if I know my last menstrual period?
A: If you know your last menstrual period, conception typically occurs about 14 days after that date.
Q4: What if my cycles are irregular?
A: For irregular cycles, this calculation may be less accurate. Ultrasound dating in early pregnancy provides more precise gestational age.
Q5: Does this account for leap years?
A: Yes, the calculator automatically accounts for leap years and varying month lengths in the date calculation.