What is Gestational Age Calculator?
A gestational age calculator helps determine how far along a pregnancy is, calculated from the first day of the last menstrual period (LMP). This crucial tool assists healthcare providers in monitoring fetal development, scheduling prenatal tests, and estimating the due date. Accurate gestational age calculation ensures proper pregnancy management, helps identify potential complications, and supports informed decision-making regarding delivery timing.
Calculate Your Gestational Age
Calculation Formula
Gestational Age = (Current Date - Last Menstrual Period Date) in weeks
Standard Formula: Naegele's Rule: EDD = LMP + 280 days
How to Use This Calculator
Enter the first day of your last menstrual period (LMP) in the date field. Click calculate to get your current gestational age in weeks and estimated due date. The calculator uses standard obstetric calculations approved by healthcare professionals. Regular prenatal checkups combined with ultrasound measurements provide the most accurate pregnancy dating.
Gestational Age Reference Table
| Weeks | Trimester | Developmental Milestones |
|---|---|---|
| 1-12 | First | Organ formation, heartbeat begins |
| 13-27 | Second | Movement felt, sex visible |
| 28-40 | Third | Lung development, weight gain |
Advantages & Disadvantages
Advantages:
- Provides quick pregnancy dating without medical equipment
- Helps plan prenatal care schedule
- Identifies high-risk pregnancies through dating discrepancies
- Supports informed decision-making for delivery timing
- Reduces unnecessary inductions through accurate dating
Disadvantages:
- Less accurate for irregular menstrual cycles
- Doesn't account for actual fetal growth variations
- Requires precise LMP recall for best accuracy
- Cannot detect multiple pregnancies
- Should be confirmed with ultrasound dating