Due Date Calculation Formula:
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The Pregnancy Calculator Due Date Ovulation estimates the expected delivery date (EDD) based on the known ovulation date. This method provides a more accurate due date calculation compared to last menstrual period (LMP) based calculations, especially for women with irregular cycles.
The calculator uses the standard medical formula:
Where:
Explanation: This calculation assumes a standard 266-day gestation period from ovulation to delivery, which corresponds to 280 days from the last menstrual period.
Details: Accurate due date calculation is essential for proper prenatal care, monitoring fetal development, planning for delivery, and identifying potential pregnancy complications. Ovulation-based dating is particularly valuable for women with irregular menstrual cycles.
Tips: Enter the known ovulation date in the date field. The calculator will automatically compute the estimated due date by adding 266 days to the ovulation date.
Q1: Why Use 266 Days From Ovulation?
A: This represents the standard gestation period from conception to delivery, as ovulation typically occurs about 14 days before the next expected period in a 28-day cycle.
Q2: How Accurate Is This Method?
A: When the ovulation date is known with certainty (through tracking methods), this method is more accurate than LMP-based calculations, especially for women with irregular cycles.
Q3: What If I Don't Know My Exact Ovulation Date?
A: If the ovulation date is uncertain, 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 provide more accurate dating in the first trimester.
Q5: What Percentage Of Babies Are Born On Their Due Date?
A: Only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the calculated due date.