HbA1c to Average Glucose Calculator

Enter your HbA1c percentage to estimate your average blood glucose level over the preceding 2-3 months.

HbA1c to Average Glucose Calculator

Convert an HbA1c percentage to an estimated average blood glucose level.

This is an estimate for general informational purposes only, not medical advice or a diagnostic tool. This conversion is a population-average formula and can differ from your own individual relationship between HbA1c and glucose readings — always follow guidance from your healthcare provider.

HbA1c reflects average blood glucose over roughly the preceding 2-3 months. The ADAG study formula converts an HbA1c percentage into an estimated average glucose (eAG) value, in mg/dL, making the number easier to relate to daily glucose meter readings.

Example

  • With the default values shown above, this calculator returns: Estimated Average Glucose (mg/dL) ≈ 140; Estimated Average Glucose (mmol/L) ≈ 7.8.

Frequently Asked Questions

What is a normal HbA1c range?

Generally, below 5.7% is considered normal, 5.7-6.4% is considered prediabetes, and 6.5% or above on two separate tests is generally used to diagnose diabetes — but only a healthcare provider can interpret your results.

Why convert HbA1c to an average glucose number?

Many people are more familiar with daily glucose meter readings in mg/dL or mmol/L than with the HbA1c percentage, so eAG translates the lab result into a more intuitive, comparable number.

Sources

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