A1C to Blood Sugar Calculator
Convert your A1C percentage to estimated average glucose (eAG) in mg/dL and mmol/L.
Understand what your A1C results mean.
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Estimated Average Glucose
A1C (HbA1c) measures your average blood sugar over the past 2-3 months. It reflects the percentage of hemoglobin proteins coated with sugar.
eAG (mg/dL) = (28.7 × A1C) - 46.7
eAG (mmol/L) = eAG (mg/dL) / 18.0
A1C interpretation:
- Below 5.7%: Normal
- 5.7% - 6.4%: Prediabetes
- 6.5% or higher: Diabetes
Target A1C for most adults with diabetes: below 7% (per ADA guidelines), though individual targets may vary.