A1C Calculator
Convert HbA1c to estimated average glucose (eAG) in mg/dL and mmol/L and back, with ADA category ranges. Educational only.
Last reviewed by the Radiatus Cloud team
Disclaimer: Educational only — not medical advice. eAG formula (ADAG study): eAG mg/dL = 28.7 × A1c − 46.7. Ranges: below 5.7% normal, 5.7–6.4% prediabetes, 6.5%+ diabetes (per ADA). Always consult your doctor.
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Convert HbA1c to average glucose
HbA1c and average blood glucose are two ways of expressing blood sugar control, and converting between them helps interpretation. This calculator converts HbA1c to estimated average glucose in mg/dL and mmol/L.
Why the two measures relate
HbA1c reflects average blood glucose over the preceding months, and it can be converted to an estimated average glucose (eAG) in the everyday units a glucose meter shows. This helps because a percentage HbA1c is abstract, while an average glucose in familiar units is easier to relate to daily readings. The conversion uses an established relationship. It is a useful aid to understanding a result, but it is general information, not a substitute for medical interpretation of what the numbers mean for a person’s health.
A health estimate
This is an estimate from a standard formula for general information, not medical advice; individual health depends on far more than any single number, so consult a professional for anything that matters. It runs entirely in your browser, so nothing you enter is uploaded, keeping your figures on your own machine.
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Frequently Asked Questions
What is HbA1c?
A measure reflecting average blood glucose over the preceding months, expressed as a percentage, used to assess blood sugar control.
What is estimated average glucose?
The average blood glucose that corresponds to an HbA1c, expressed in the everyday units (mg/dL or mmol/L) a glucose meter shows.
Why convert between them?
Because a percentage HbA1c is abstract, while an average glucose in familiar units is easier to relate to daily meter readings.
Is this a diagnosis?
No. It converts between two measures as general information. What the numbers mean for health is for a medical professional to interpret.
Is my data uploaded?
No. The calculation runs entirely in your browser.
Privacy & Security
Runs entirely in your browser. No data is sent to any server.
How to Use
Enter your A1c percentage or your average glucose — each converts to the other instantly with the ADA range category.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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