1. What is Gestational Age by EDD?

Gestational age calculated from the Estimated Due Date (EDD) provides an estimate of how far along a pregnancy is. It's based on the standard 40-week pregnancy duration minus the time remaining until the due date.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• EDD — Estimated Due Date (date of 40 weeks gestation)
• Current Date — Today's date or any date you want to check
• 7 — Days in a week
• 40 — Standard full-term pregnancy duration in weeks

Explanation: The formula calculates how many weeks remain until the due date and subtracts this from 40 weeks to determine current gestational age.

3. Importance of Gestational Age Calculation

Details: Knowing gestational age is crucial for proper prenatal care, monitoring fetal development, scheduling tests, and determining if the baby is growing appropriately.

4. Using the Calculator

Tips: Enter the estimated due date (EDD) and the current date (defaults to today). 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: It's reasonably accurate if the EDD was determined by first-trimester ultrasound. Last menstrual period dating can be less accurate.

Q2: What if my current date is after the EDD?
A: The calculator will indicate this, as gestational age cannot be calculated when the current date is past the due date.

Q3: Why 40 weeks for full term?
A: 40 weeks is the standard duration used in obstetrics, though normal pregnancies can range from 37-42 weeks.

Q4: Does this work for IVF pregnancies?
A: Yes, if the EDD was calculated based on the embryo transfer date or known conception date.

Q5: How does this compare to ultrasound dating?
A: Early ultrasound dating (first trimester) is most accurate. This calculator assumes the EDD is correct.