Due Date Calculation:
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The pregnancy due date is calculated by adding 266 days (38 weeks) to the ovulation date. This method is based on the typical human gestation period from conception.
The calculator uses the following simple formula:
Explanation:
Details: Knowing the accurate due date helps in:
Instructions: Simply enter the date of ovulation (the day you conceived) and the calculator will add 266 days to determine your estimated due date.
Q1: Why 266 days instead of 280 days (40 weeks)?
A: 280 days is based on last menstrual period (LMP), while 266 days is from actual conception (ovulation typically occurs about 14 days after LMP).
Q2: How accurate is this calculation?
A: When ovulation date is known precisely (through tracking or fertility treatments), this method is more accurate than LMP-based calculations.
Q3: What if I don't know my exact ovulation date?
A: If you don't know your ovulation date, use an LMP-based calculator instead.
Q4: Does this account for leap years?
A: Yes, the calculator automatically accounts for leap years in the calculation.
Q5: Why might my actual delivery date differ?
A: Only about 5% of women deliver on their exact due date. Normal delivery can occur between 37-42 weeks.