Online Tool Store
A1C to Average Glucose Converter
Convert an A1C percentage to estimated average glucose (eAG) in mg/dL or mmol/L, using the ADAG study formula. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
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estimated average glucose (eAG)
Educational estimate only — not a substitute for lab results or medical advice.
How it works
- Enter your A1C percentage.
- Choose mg/dL or mmol/L for the result.
- See your estimated average glucose and diagnostic range.
The formula
eAG (mg/dL) = 28.7 × A1C − 46.7 (ADAG study formula)
eAG (mmol/L) = eAG (mg/dL) ÷ 18.0182
FAQ
What is A1C?
A blood test (hemoglobin A1C) that reflects average blood glucose over the past 2–3 months, rather than a single point-in-time reading like a finger-stick glucose test — used to diagnose and monitor diabetes and prediabetes.
What is eAG?
Estimated Average Glucose — an A1C percentage translated into the same mg/dL or mmol/L units used by a daily glucose meter, making it easier to relate a lab result to day-to-day readings.
How accurate is the formula?
It uses the published ADAG (A1C-Derived Average Glucose) study formula, a widely cited linear relationship — a solid estimate, but actual glucose patterns vary between individuals with the same A1C.
Is this a diagnosis?
No — this is an educational estimate, not a diagnosis. Always discuss lab results with a healthcare provider.
How we compare
| Feature | Online Tool Store | Manual formula calculation | Diabetes management apps |
|---|---|---|---|
| Both mg/dL and mmol/L | ✓ | Convert manually after calculating | ✓ |
| No account or app install | ✓ | ✓ | Usually requires sign-up |
For quickly translating a lab result into the same units your glucose meter uses, this is faster than doing the arithmetic by hand.