Estimated Gestational Age
Estimate gestational age from the first day of the last menstrual period.
Enter Patient Parameters
Fields marked with * are required.
Enter Patient Parameters
Enter the required values to calculate the clinical estimate.
Clinical Result
Your calculated result and its clinical interpretation.
Result will appear here
Complete the patient parameters and select Calculate to see the value, classification, and clinical explanation.
Interpretation
This calculator provides an estimate based on the information entered. The result should be interpreted in the context of the patient's clinical condition, laboratory data, medications, and the purpose for which the estimate is being used.
Calculator outputs are estimates and are not a diagnosis or a substitute for clinical judgment.
Calculation Details
Inputs and methodology used by this tool.
When to Use
- Use as a structured clinical estimation aid when the required patient variables are available.
- Review the assumptions and limitations of the underlying equation before acting on the result.
- Combine the calculated value with the broader clinical picture rather than using it in isolation.
Clinical Considerations
Verify the inputs before relying on the result.
Consider relevant laboratory and clinical context.
Do not use the result as a stand-alone diagnosis.
Factors Affecting the Result
First day of last menstrual period
Use the first day of the patient's last menstrual period when menstrual dating is available.
Estimated due date
Alternatively, enter the estimated due date to calculate gestational age.
Assessment date
The date on which gestational age is being calculated.
Clinical disclaimer
This calculator is provided for educational and clinical decision-support purposes. Results depend on the accuracy of the information entered and should be verified against current clinical guidance and the individual patient context.
Related Calculators
More clinical tools in Obstetrics.