A1C to Average Blood Sugar Converter (eAG)
Quickly convert between Hemoglobin A1C (%) and estimated average glucose (eAG). Use this tool to understand lab results, monitor diabetes control, and translate A1C into the daily glucose numbers you see on a meter.
Convert A1C → Average Glucose (eAG)
Convert Average Glucose → A1C
What these numbers mean
A1C reflects average blood glucose over ~2–3 months. The estimated average glucose (eAG) translates that percentage into the daily numbers you see on a glucose meter. Use both to understand long-term control and short-term trends.
Common A1C categories
- Normal: below 5.7% (eAG ≈ <117 mg/dL)
- Prediabetes: 5.7%–6.4% (eAG ≈ 117–137 mg/dL)
- Diabetes: ≥6.5% (eAG ≈ ≥140 mg/dL — diagnostic when confirmed)
Important cautions
A1C may be inaccurate in conditions that affect red blood cells or hemoglobin (recent blood loss, anemia, hemoglobin variants, pregnancy, and some kidney or liver diseases). If results don’t match symptoms or glucose logs, discuss alternative tests (fructosamine, continuous glucose monitoring) with your clinician.
FAQ
Q: How accurate is the conversion?
A: The formula provides an estimate that is widely used clinically, but individual biology varies — use it as a guide, not a diagnosis.
Q: Can I use this to diagnose diabetes?
A: No — diagnosis requires proper lab testing and confirmation by a clinician; this tool helps interpret results and understand eAG.
Q: Why are mg/dL and mmol/L different?
A: mg/dL (used in the US) and mmol/L (used in many countries) are two units for reporting glucose. Convert mg/dL → mmol/L by dividing by 18.