What Is My Estimated Average Glucose From A1C?
Use this A1C to Average Glucose Calculator to estimate average blood sugar in mg/dL from an A1C percentage. The calculator uses the ADAG equation: estimated average glucose = 28.7 × A1C − 46.7.
A1C reflects how much glucose has attached to hemoglobin in red blood cells over about the past 2 to 3 months. Estimated average glucose, or eAG, puts that A1C result into the same mg/dL units many home glucose meters use.
This calculator can help you understand the general meaning of an A1C result, but it does not diagnose diabetes, replace lab testing, or explain daily glucose swings. Talk with a healthcare professional about personal results and next steps.
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This calculator is for general education only and is not a diagnosis, treatment plan, or substitute for advice from a qualified healthcare professional.
Average glucose can be estimated from A1C using the ADAG equation: estimated average glucose in mg/dL = 28.7 × A1C − 46.7. For example, an A1C of 7% estimates an average glucose of about 154 mg/dL. This is an estimate, not a direct glucose measurement.
Estimated average glucose, or eAG, translates an A1C percentage into mg/dL, the same unit used by many glucose meters. It represents average blood sugar exposure over about 2 to 3 months. It does not show daily highs, lows, meal spikes, or current glucose level.
A1C is not the same as average blood sugar, but it is related. A1C measures the percentage of hemoglobin with glucose attached, while eAG estimates the average glucose level that often matches that A1C. Certain health conditions can make A1C less accurate.
No, this A1C calculator cannot diagnose diabetes or prediabetes. It only converts an A1C percentage into an estimated average glucose value. Diagnosis depends on validated lab testing, medical history, symptoms, and a healthcare professional’s interpretation of results.
A1C may not match glucose meter readings because it reflects a longer-term average and can miss daily highs and lows. It may also be affected by anemia, kidney disease, liver disease, pregnancy, recent blood loss, transfusion, or hemoglobin variants. Meter timing and accuracy can also matter.
Common lab categories define A1C below 5.7% as normal, 5.7% to 6.4% as prediabetes, and 6.5% or higher as diabetes if confirmed by appropriate testing. These categories are not a personal diagnosis. A healthcare professional can explain what a result means for you.