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A1C Estimator: Convert Average Blood Glucose (eAG) to A1C %

Use our free A1C calculator to quickly estimate your A1C percentage based on your average blood glucose (eAG) reading. This tool is vital for those monitoring blood sugar levels for diabetes management.

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Result Summary

[Your estimated A1C will appear here]

This is an estimate. Always confirm with a lab test and consult your doctor.

Understanding the A1C Test and Your Blood Sugar Control

Monitoring your blood sugar level over time is a critical aspect of managing your overall health, especially for those with or at risk of diabetes. The A1C test, also known as glycated hemoglobin or HbA1c, is one of the most important indicators of long-term blood sugar control, reflecting your average blood sugar levels over the past two to three months.

⚠️ Medical Disclaimer: This tool provides an estimate based on a standard formula. It is NOT a substitute for a laboratory A1C test or professional medical advice. Always consult your healthcare provider to discuss your results and treatment plan.
Diagram illustrating the relationship between blood glucose and A1C levels
The Cystography.com A1C Estimator helps bridge the gap between daily blood glucose readings and the long-term A1C result.

How is A1C Calculated from Average Blood Glucose (eAG)?

Our calculator uses the scientifically validated ADA/EASD formula to convert your Average Blood Glucose (eAG) reading into an estimated A1C percentage.

The A1C Conversion Formula:

$$ \text{A1C} (\%) = \frac{\text{eAG} \text{ (mg/dL)} + 46.7}{28.7} $$

The tool also handles conversion from mmol/L to mg/dL for global accuracy.

Why Estimate Your A1C and What Do the Numbers Mean?

An estimated A1C provides a snapshot of your glycemic control between lab tests, helping you understand the impact of your recent diet and activity changes.

Knowing this number empowers you to have a more informed discussion with your healthcare team about managing your condition. For more preventative health insights, be sure to check our other tools like the Cardiovascular Risk Calculator and BMR Calculator.