1. What is the Due Date Calculation?

The due date calculation estimates pregnancy due date from the known ovulation date by adding 266 days (38 weeks). This method is more accurate than last menstrual period (LMP) dating when the ovulation date is known.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Ovulation Date — The known date of ovulation/conception
• 266 days — The average length of pregnancy from ovulation

Explanation: Human gestation typically lasts 266 days (38 weeks) from conception, or 280 days (40 weeks) from the last menstrual period.

3. Importance of Due Date Calculation

Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, and planning for delivery.

4. Using the Calculator

Tips: Enter the known ovulation date. The calculator will add 266 days to estimate the due date.

5. Frequently Asked Questions (FAQ)

Q1: Why 266 days from ovulation?
A: Research shows the average pregnancy lasts 266 days (38 weeks) from conception/ovulation to birth.

Q2: How does this compare to LMP dating?
A: LMP dating adds 280 days (assuming day 14 ovulation). Ovulation dating is more accurate when ovulation date is known.

Q3: Is the due date exact?
A: No, it's an estimate. Only 5% of women deliver on their exact due date. Most deliver within 2 weeks before or after.

Q4: What if I don't know my ovulation date?
A: If ovulation date is unknown, use LMP dating (first day of last period + 280 days) or consult ultrasound dating.

Q5: Can this be used for IVF pregnancies?
A: Yes, it's particularly accurate for IVF pregnancies where conception date is precisely known.