1. What is Gestational Age Calculation?

Gestational age is the common term used during pregnancy to describe how far along the pregnancy is. It is measured in weeks from the first day of the woman's last menstrual period to the current 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 date of interest

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

3. Importance of Gestational Age

Details: Accurate gestational age calculation is crucial for proper prenatal care, timing of tests, monitoring fetal growth, and determining the best time for delivery.

4. Using the Calculator

Tips: Enter the estimated due date (EDD) and the current date. The calculator will determine the gestational age in weeks.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This provides a good estimate but may differ slightly from ultrasound-based gestational age, especially later in pregnancy.

Q2: What if my current date is after the EDD?
A: The calculator will show a gestational age greater than 40 weeks (post-term pregnancy).

Q3: Why use 40 weeks as the baseline?
A: 40 weeks is considered full term for pregnancy, though normal delivery can occur between 37-42 weeks.

Q4: Can I use this for IVF pregnancies?
A: For IVF pregnancies, gestational age is typically calculated from the embryo transfer date.

Q5: How does this compare to LMP-based calculation?
A: This method using EDD is often more accurate than last menstrual period (LMP) dating, especially if the EDD was determined by early ultrasound.