1. What is EDD Calculation?

The Estimated Due Date (EDD) calculation helps determine when a baby is likely to be born based on the current gestational age. It's a fundamental tool in prenatal care for monitoring pregnancy progression.

2. How Does the Calculator Work?

The calculator uses the standard formula:

Where:

• Current Date — The date of calculation
• Gestational Age — Current pregnancy duration in weeks
• 40 — Standard full-term pregnancy duration in weeks
• 7 — Days per week conversion factor

Explanation: The formula calculates how many weeks remain until the full 40-week term and converts those weeks to days to add to the current date.

3. Importance of EDD Calculation

Details: Accurate EDD estimation is crucial for proper prenatal care scheduling, monitoring fetal development, and planning for delivery. It helps identify potential preterm or post-term pregnancies.

4. Using the Calculator

Tips: Enter the current date and accurate gestational age in weeks (can include decimals for partial weeks). The gestational age should be between 0 and 40 weeks.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this EDD calculation?
A: This provides a general estimate. The most accurate dating comes from first-trimester ultrasound measurements.

Q2: What if I know my last menstrual period (LMP) date?
A: For LMP-based calculation, use Naegele's rule: EDD = LMP + 1 year - 3 months + 7 days.

Q3: Why 40 weeks as the standard pregnancy duration?
A: 40 weeks (280 days) is the traditional human gestation period calculated from the first day of the last menstrual period.

Q4: What percentage of babies are born exactly on their EDD?
A: Only about 5% of women deliver on their exact EDD. Most deliver within 2 weeks before or after.

Q5: Does this work for IVF pregnancies?
A: For IVF pregnancies, the conception date is known precisely, so EDD should be calculated from embryo transfer date plus 266 days.