A1C to Average Blood Sugar Calculator (eAG)
Enter your A1C to see your estimated average blood sugar, or the reverse.
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A1C to Average Blood Sugar Calculator (eAG) by TheCalcTools
How the A1C to Average Blood Sugar Calculator (eAG) works
HbA1c reflects average blood glucose over the past two to three months. The A1C-Derived Average Glucose (ADAG) study found eAG (mg/dL) = 28.7 × A1C − 46.7, the formula used by the American Diabetes Association.
Divide mg/dL by 18 to get mmol/L. The IFCC unit (mmol/mol) is used in the UK and Europe. The diagnostic ranges are the ADA thresholds for adults; a diagnosis needs confirmation by a clinician.
The formula
Worked example
Using the default values shown in the calculator:
| Convert | A1C to average glucose |
|---|---|
| HbA1c (%) | 7 |
| Average glucose (mg/dL) | 154 |
- A1C 7%: 28.7 × 7 − 46.7 = 154 mg/dL (8.6 mmol/L).
- IFCC: 53 mmol/mol; Diabetes range (6.5% or higher).
Result:
| Estimated average glucose (mg/dL) | 154 |
|---|---|
| Estimated average glucose (mmol/L) | 8.6 |
| HbA1c (%) | 7.0 |
| HbA1c (IFCC, mmol/mol) | 53 |
| Diagnostic range (adults) | Diabetes range (6.5% or higher) |
Frequently asked questions
What A1C target should I aim for?
Many adults with diabetes aim for below 7%, but targets are individual. Ask your clinician.
Why does my meter average differ from eAG?
Finger-stick averages depend on when you test. Conditions such as anaemia also affect A1C.
Sources and further reading
- American Diabetes Association: eAG/A1C conversion (ADAG study)
- Nathan DM et al. (2008) Translating the A1C assay into estimated average glucose values. Diabetes Care 31:1473
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This calculator gives general estimates for information and education. It is not medical advice and does not diagnose anything. Talk to a qualified health professional about your own situation. See our disclaimer.