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Due Date Formula:
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The Pregnancy Due Date Calculator By Ovulation Date estimates the expected delivery date based on the known date of ovulation. This method provides a more accurate due date calculation compared to traditional last menstrual period (LMP) methods.
The calculator uses the ovulation date formula:
Where:
Explanation: This calculation adds 266 days (38 weeks) to the ovulation date, which represents the typical gestation period from conception to delivery.
Details: Accurate due date calculation is essential for proper prenatal care, monitoring fetal development, planning for delivery, and identifying potential pregnancy complications.
Tips: Enter the known ovulation date. The calculator will add 266 days to provide the estimated due date. Ensure the ovulation date is accurate for best results.
Q1: Why use ovulation date instead of last menstrual period?
A: Ovulation date provides a more precise calculation since it marks the actual time of conception, eliminating variability in menstrual cycle length.
Q2: How accurate is the 266-day calculation?
A: This method is highly accurate when the ovulation date is known, as it directly calculates from conception. Only about 5% of women deliver exactly on their due date.
Q3: What if I don't know my exact ovulation date?
A: If ovulation date is unknown, use the last menstrual period method (LMP + 280 days) or consult with your healthcare provider for ultrasound dating.
Q4: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, which can be more accurate than date-based calculations.
Q5: Why 266 days instead of 280 days?
A: 280 days is from the last menstrual period, while 266 days is from ovulation/conception. Pregnancy is typically 38 weeks from conception or 40 weeks from LMP.