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Diabetes & Lab Results · HC-016

HbA1c and Estimated Average Glucose (eAG) Converter

Hemoglobin A1c reflects blood glucose exposure over roughly the preceding two to three months. Estimated average glucose (eAG) puts an A1c value into familiar blood-glucose units.

Enter your values

Calculations run in your browser. No inputs are sent to our server.

For A1c mode enter 4–16%; for glucose mode enter 70–450 mg/dL.

Result

Enter your values and select Calculate to see the result and an explanation.
Educational support only. Results are not medical advice and cannot replace professional assessment or your institution's protocols.

How the calculation works

The ADAG study relationship is eAG (mg/dL) = 28.7 × HbA1c (%) − 46.7. Approximate mmol/L = mg/dL ÷ 18.0182. The reverse mode solves this equation algebraically.

Worked example

An A1c of 7.0% corresponds to an eAG of about 154 mg/dL (8.6 mmol/L).

Understanding the result

eAG is a statistical estimate, not a measurement of your glucose at a particular moment. Individuals with the same A1c can have different patterns of glucose fluctuation.

The reverse conversion is not a diagnostic laboratory test and differs from the glucose management indicator (GMI) used with some CGM reports.

Limitations

A1c may be misleading in certain conditions affecting red blood cells or hemoglobin. Use clinical context and laboratory results.