What is Gestational Age?
Gestational age calculation helps determine pregnancy progress and due date. Our calculator uses medical-standard formulas to estimate fetal development stages, crucial for prenatal care planning. Accurate pregnancy dating helps monitor fetal growth, schedule tests, and prepare for delivery. Healthcare providers use gestational age to assess development milestones and identify potential pregnancy complications early.
Pregnancy Calculator
Calculation Formula
Gestational age = (Current date - Last Menstrual Period Date) + 280 days
Standard medical formula: Naegele's Rule: Due Date = LMP + 280 days
How to Use
1. Enter first day of last menstrual period
2. Click calculate button
3. Get gestational age in weeks + days
4. Receive estimated due date
5. Track pregnancy milestones
Gestational Age Chart
| Trimester | Weeks | Development Stage |
|---|---|---|
| First | 1-12 | Organ formation |
| Second | 13-28 | Rapid growth |
| Third | 29-40 | Final preparation |
Pros and Cons
Advantages:
• Quick pregnancy dating
• Helps plan prenatal tests
• Estimates fetal growth patterns
• Identifies premature risks
• Guides delivery preparation
Limitations:
• Requires accurate LMP recall
• Doesn't account for cycle variations
• Ultrasound confirmation needed
• Irregular cycles affect accuracy
• Multiple pregnancy variations
FAQs
1. How accurate is gestational age calculation?
LMP-based calculation provides initial estimate but ultrasound confirmation between 8-13 weeks gives most accurate dating. Variations occur in irregular cycles.