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HbA1c and estimated average glucose converter
Convert laboratory HbA1c and eAG in mg/dL or mmol/L both ways with the ADAG equation, keeping directly measured and derived values distinct. privacy-first-browser-tooling
Who it helps
- See the equation, display rounding, restrained threshold context, and A1C interference limits; this is educational and not diagnostic.
- eAG mg/dL = 28.7 × HbA1c − 46.7; inverse HbA1c = (eAG mg/dL + 46.7) ÷ 28.7; mmol/L = mg/dL ÷ 18. Display eAG at whole mg/dL/0.1 mmol/L and HbA1c at 0.1%. Only directly entered HbA1c receives <5.7, 5.7–6.4, or ≥6.5 context; derived HbA1c is not diagnostically classified. HbA1c below 4% or above 12% receives an extrapolation warning; 98.5% of ADAG samples had HbA1c from 4–10%, and prediction intervals widened toward 12%.
- directly entered HbA1c 7.0% gives unrounded eAG 154.2 mg/dL (8.566… mmol/L), displayed as 154 mg/dL and 8.6 mmol/L.
What you can enter
- directly entered HbA1c 7.0% gives unrounded eAG 154.2 mg/dL (8.566… mmol/L), displayed as 154 mg/dL and 8.6 mmol/L.
- eAG mg/dL = 28.7 × HbA1c − 46.7; inverse HbA1c = (eAG mg/dL + 46.7) ÷ 28.7; mmol/L = mg/dL ÷ 18. Display eAG at whole mg
How to read results
eAG mg/dL = 28.7 × HbA1c − 46.7; inverse HbA1c = (eAG mg/dL + 46.7) ÷ 28.7; mmol/L = mg/dL ÷ 18. Display eAG at whole mg/dL/0.1 mmol/L and HbA1c at 0.1%. Only directly entered HbA1c receives <5.7, 5.7–6.4, or ≥6.5 context; derived HbA1c is not diagnostically classified. HbA1c below 4% or above 12% receives an extrapolation warning; 98.5% of ADAG samples had HbA1c from 4–10%, and prediction intervals widened toward 12%. privacy-first-browser-tooling
Data and privacy
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FAQ
HbA1c and estimated average glucose converter：Which laboratory values can I enter?
Choose a directly measured laboratory HbA1c from 3.0–20.0%, or enter a positive eAG in mg/dL or mmol/L. eAG estimates an average over time; it is not one glucose-meter or CGM reading.
HbA1c and estimated average glucose converter：How are values converted and rounded?
The ADAG equation is eAG mg/dL = 28.7 × HbA1c − 46.7; the inverse is HbA1c = (eAG mg/dL + 46.7) ÷ 28.7, and mmol/L = mg/dL ÷ 18. The display rounds eAG to whole mg/dL and 0.1 mmol/L and HbA1c to 0.1%, while calculation retains full precision.
HbA1c and estimated average glucose converter：Can the result diagnose diabetes?
No. Only a directly entered laboratory HbA1c receives light threshold context; an HbA1c derived from eAG is never diagnostically classified. HbA1c below 4% or above 12% receives an extrapolation warning; 98.5% of ADAG samples had HbA1c from 4–10%, and prediction intervals widened toward 12%. Altered red-cell lifespan, recent blood loss or transfusion, anemia, erythropoietin treatment, hemoglobin variants, dialysis, kidney failure, or liver disease can make A1C unreliable. Use the original report and professional interpretation.
HbA1c and estimated average glucose converter：Are my health values uploaded or recorded?
No. Values and results are calculated only in current browser memory and are not uploaded or stored. GA4 may receive only tool, category, and locale—not laboratory values, units, reminders, or result content.