HbA1c ↔ Average Blood Sugar Converter
Convert between HbA1c percentage and estimated average glucose (ADAG formula)
Enter Value
%
Results
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Enter your HbA1c or average glucose value.
Formula
eAG (mg/dL) = (28.7 × HbA1c %) − 46.7 eAG (mmol/L) = (1.594 × HbA1c %) − 2.594
- HbA1c (%) — Glycated haemoglobin percentage
Example: HbA1c 6.5% → eAG = (28.7 × 6.5) − 46.7 ≈ 140 mg/dL
Interpreting Your Result
< 5.7%
Normal
No indication of diabetes
5.7–6.4%
Prediabetes
Elevated risk — lifestyle changes recommended
≥ 6.5%
Diabetes
Consistent with a diabetes diagnosis — consult a doctor
Frequently Asked Questions
What is HbA1c?
HbA1c reflects average blood glucose over 2–3 months by measuring how much glucose has attached to haemoglobin in red blood cells.
How is HbA1c different from a glucose test?
A blood glucose test is a snapshot. HbA1c gives a 3-month average, making it more reliable for diagnosis and monitoring.