Gestational Age
Current gestational age in weeks and days.
RESULT
Gestational Age
What is Gestational Age?
Current gestational age in weeks and days. Gestational Age is intended for use in: Pregnant patients.
How to Use the Gestational Age Calculator
- Enter Last menstrual period (LMP) date. Enter as YYYY-MM-DD
- Enter As-of date (optional). Defaults to today (YYYY-MM-DD)
- Click Calculate to see your result and interpretation.
Formula & Version
This calculator uses formula version 1.0, last reviewed September 2026.
Clinical Considerations & Limitations
- LMP-based dating can be inaccurate with irregular cycles — ultrasound dating in the first trimester is generally more reliable when available.
References
- Standard obstetric dating convention: Gestational Age = (As-of date − LMP) in weeks + days
Frequently Asked Questions
What is Gestational Age?
Current gestational age in weeks and days.
Who is Gestational Age intended for?
Pregnant patients. Always confirm applicability to your specific patient before use.
What are the limitations of Gestational Age?
LMP-based dating can be inaccurate with irregular cycles — ultrasound dating in the first trimester is generally more reliable when available.
What formula or reference does Gestational Age use?
Standard obstetric dating convention: Gestational Age = (As-of date − LMP) in weeks + days
Is Gestational Age a diagnosis?
No. Gestational Age produces a score or estimate to support clinical decision-making — it is not a diagnosis and should be interpreted alongside full clinical judgement.
Medical Disclaimer: Medical calculators are provided for informational and educational purposes only. Results should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always verify results with a qualified healthcare professional.
