1. What is the Due Date Calculator?

The Baby Due Date Calculator estimates the expected delivery date based on the date of ovulation. This method is more accurate than calculating from the last menstrual period (LMP) for women with irregular cycles.

2. How Does the Calculator Work?

The calculator uses the standard medical calculation:

Where:

• 266 days — Average length of human pregnancy from ovulation
• Ovulation Date — The date when ovulation occurred

Explanation: Pregnancy is typically 266 days (38 weeks) from conception (ovulation) or 280 days (40 weeks) from the first day of the last menstrual period.

3. Importance of Due Date Calculation

Details: An accurate due date helps monitor fetal development, schedule prenatal tests, and prepare for delivery. Only about 5% of women deliver on their exact due date.

4. Using the Calculator

Tips: Enter the date you ovulated (if known from tracking) or the date of conception. The calculator will add 266 days to estimate your due date.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: Very accurate if you know your exact ovulation date. Most pregnancies last between 259-280 days from ovulation.

Q2: What if I don't know my ovulation date?
A: Use our LMP-based calculator instead, or consult your healthcare provider for an ultrasound dating scan.

Q3: Why 266 days instead of 280?
A: 280 days is from LMP (includes 2 weeks before ovulation). This calculator uses the biological conception point.

Q4: Does this account for leap years?
A: Yes, the calculator automatically adjusts for leap years in the date calculation.

Q5: Can the due date change?
A: Early ultrasound measurements may adjust the due date, especially if they differ significantly from this calculation.