A1C to Average Glucose (eAG) Converter
Convert A1C percentage to estimated average glucose in mg/dL and mmol/L, ADA formula.
A mathematical conversion, not a diagnosis — this is the same formula printed on ADA conversion charts, but only your doctor can interpret it alongside your full history. Not medical advice.
Estimated average glucose (eAG)
111 mg/dL
Normal
In mmol/L
6.2 mmol/L
The unit used outside the U.S.
For informational and educational purposes only — not medical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why A1C translates into a glucose number at all
A1C measures the percentage of hemoglobin coated in glucose — a byproduct of blood sugar levels over a red blood cell's roughly 3-month lifespan — so it reflects an average, not a single reading. The eAG formula, published by the American Diabetes Association from a large study correlating A1C with continuous glucose monitoring data, translates that percentage into the same mg/dL or mmol/L units a glucose meter reports, making it easier to compare against day-to-day readings. The 5.7% and 6.5% category cutoffs are the ADA's own diagnostic thresholds for prediabetes and diabetes.
Frequently asked questions
What's the ADA formula this converter uses?
The American Diabetes Association's published linear formula (eAG = 28.7 × A1C − 46.7 in mg/dL) that translates the A1C percentage from a lab test into an estimated average glucose level over the preceding ~3 months.
Does this replace a doctor's interpretation of my A1C result?
No — this is a unit conversion, not medical interpretation. A1C and eAG results should be reviewed with your doctor, who can account for your full health history and any factors that can affect A1C accuracy.