A1C Calculator
Convert HbA1c to estimated average glucose (eAG) in mg/dL and mmol/L and back, with ADA category ranges. Educational only.
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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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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