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A1C to Average Glucose Calculator
HbA1c reflects average blood sugar over ~3 months. This calculator converts A1c % into estimated average glucose (eAG) with the standard ADAG formula: eAG (mg/dL) = 28.7 × A1c − 46.7. Educational use only — not medical advice.
The ADAG formula
eAG (mg/dL) = 28.7 × A1c − 46.7. So A1c 7.0% ≈ 154 mg/dL (8.6 mmol/L), and A1c 6.0% ≈ 125 mg/dL (7.0 mmol/L). The relationship comes from the ADAG study, which measured continuous glucose against A1c in hundreds of people.
What eAG is not
eAG is an estimate with real scatter: two people with the same A1c can have different true averages (anemia, kidney disease and other conditions shift A1c independently of glucose). Treat it as a translation aid for understanding lab results, and discuss targets with your clinician.
Frequently Asked Questions
What is a good A1c?
Targets are personal — many guidelines suggest under 7% for most adults with diabetes, but your clinician sets your target based on your situation. This tool does not set targets.
mg/dL or mmol/L?
The US uses mg/dL; most of the rest of the world uses mmol/L (divide mg/dL by 18). The tool shows both.
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