Glucose To A1c Calculator
Convert average blood glucose levels to estimated HbA1c percentage and vice versa using the ADAG formula.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Glucose to A1c Calculator
This tool converts between your average blood glucose (mg/dL) and estimated A1c (%) using the ADAG formula. Follow these steps:
- Enter one value only — either your average glucose (mg/dL) or your A1c (%). Do not fill both fields.
- Valid ranges: Glucose must be between 20 and 600 mg/dL. A1c must be between 3% and 20%.
- Click "Calculate" to see the converted result instantly.
- Read the result — the output shows the estimated value and the formula used.
Note: This calculator uses the ADAG formula: A1c = (Glucose + 46.7) / 28.7 and Glucose = 28.7 × A1c − 46.7. It works only with mg/dL units.
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Frequently Asked Questions
The ADAG (A1c-Derived Average Glucose) formula is a validated equation that estimates the average blood glucose level from an HbA1c percentage, and vice versa. The formula is: Estimated A1c (%) = (Average Glucose (mg/dL) + 46.7) / 28.7.
The ADAG formula provides a good estimate for most people, but individual results may vary. Factors like red blood cell lifespan, anemia, and certain hemoglobin variants can affect the relationship between glucose and A1c. Always consult your healthcare provider for personalized advice.
Currently, this calculator uses mg/dL for glucose. For mmol/L, you would need to convert first (1 mmol/L = 18.018 mg/dL). A future update may include direct mmol/L support.
