1. What is Gestational Age by EDD?

Gestational age calculated from the Estimated Due Date (EDD) is a method to determine how far along a pregnancy is. It estimates the time elapsed since the first day of the last menstrual period (LMP) by working backward from the due date.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• EDD — Estimated Due Date (calculated as LMP + 280 days)
• Current Date — Today's date or any date you want to check
• 40 — Standard pregnancy duration in weeks
• 7 — Days per week conversion factor

Explanation: The formula calculates how many weeks remain until the due date and subtracts this from 40 weeks (full term pregnancy).

3. Importance of Gestational Age Calculation

Details: Accurate gestational age determination is crucial for proper prenatal care, timing of tests, monitoring fetal growth, and determining if interventions are needed.

4. Using the Calculator

Tips: Enter the estimated due date (typically provided by your healthcare provider) and the current date. The calculator will determine how many weeks pregnant this corresponds to.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is gestational age by EDD?
A: This method assumes a standard 28-day cycle with ovulation on day 14. Accuracy depends on regular cycles and correct recall of LMP.

Q2: What if my EDD was calculated by ultrasound?
A: Ultrasound-determined EDD (especially first trimester) is often more accurate than LMP-based dating.

Q3: What are normal gestational age ranges?
A: Full term is 37-42 weeks. Preterm is before 37 weeks, postterm is after 42 weeks.

Q4: Why does the result sometimes show negative values?
A: Negative values occur when the current date is after the EDD, indicating the pregnancy is past due.

Q5: Can I use this for IVF pregnancies?
A: For IVF pregnancies, gestational age should be calculated from embryo transfer date plus 2 weeks.