HbA1c to Average Glucose (eAG) Calculator

How to calculate eAG?

The estimated Average Glucose (eAG) is derived from the A1c-Derived Average Glucose (ADAG) clinical study, which established a clear mathematical relationship between your HbA1c percentage and your average blood glucose levels.

eAG (mg/dL) = (28.7 × HbA1c) - 46.7

Using the calculator: an example

For a person with an 8% HbA1c, the conversion to eAG would be calculated as follows:

Step-by-step calculation:

• Multiply 8 by 28.7 (229.6)
• Subtract 46.7 from the result (229.6 - 46.7)
• Result: 183 mg/dL

Frequently Asked Questions

What does HbA1c measure?

HbA1c measures the percentage of your glucose-coated hemoglobin. Because red blood cells live for about 3 months, it reflects your average glucose level over that period.

Why convert to eAG?

Converting to eAG translates the A1c percentage into the same units (mg/dL) used by home glucose monitors and CGMs, making it easier to compare your long-term average with daily readings.

Are results always accurate?

While highly reliable, individual patterns may vary due to factors like red blood cell lifespan, anemia, or other hemoglobin variants. Always consult your healthcare provider to interpret your results in clinical context.