A1C Calculator (A1C to Average Blood Sugar)
A1C calculator: convert hemoglobin A1C to estimated average glucose (eAG) in mg/dL and mmol/L, and to IFCC units — or back.
eAG = 28.7 · A1C − 46.7
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
eAG = 28.7 × A1C − 46.7 (ADAG study). A1C reflects average blood sugar over the last 2–3 months.
Below 5.7 % is normal, 5.7–6.4 % prediabetes, 6.5 % or more diabetes.
For general information only; it does not replace advice from a doctor or other health professional.
Formula
eAG = 28.7 · A1C − 46.7
| Symbol | Quantity | Units |
|---|---|---|
| A1C | A1C | %, × |
| eAG | Estimated average glucose, mg/dL | — |
Worked example
Given: A1C = 7 %
eAG = 28.7 A1C − 46.7
Result: eAG = 154.2
Estimated average glucose, mg/dL for different values of A1C
| A1C · A1C | eAG · Estimated average glucose, mg/dL |
|---|---|
| 5.6 % | 114.02 |
| 6.3 % | 134.11 |
| 7 % | 154.2 |
| 7.7 % | 174.29 |
| 8.4 % | 194.38 |
| 9.1 % | 214.47 |
Other values as in the worked example.
Frequently asked questions
A1C of 7 %?
eAG ≈ 154 mg/dL (8.6 mmol/L), 53 mmol/mol.
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