A1C Calculator
A1C ↔ estimated average glucose using eAG = 28.7 × A1C − 46.7. Click any i for detail.
Lab math
Direction
i
Direction
A1C to eAG, or average glucose to A1C. |
|
|---|---|
A1C (%)
i
A1C
Lab A1C percent. |
|
Average glucose (mg/dL)
i
eAG
Estimated average glucose. |
How to use this calculator
- Choose direction.
- Enter A1C or average glucose.
- Read the other value in mg/dL and mmol/L.
Results explained
This is the ADA/ADAG regression, not your meter’s unique calibration.
Quick reference: A1C ↔ eAG
Approximate pairs.
| Item | Detail |
|---|---|
| 5.0% A1C | eAG ≈ 97 mg/dL |
| 6.5% A1C | eAG ≈ 140 mg/dL |
| 7.0% A1C | eAG ≈ 154 mg/dL |
| 8.0% A1C | eAG ≈ 183 mg/dL |
Targets are individualized. This table is not a treatment goal.
How the estimate is built
eAG (mg/dL) = 28.7 × A1C − 46.7. mmol/L = mg/dL ÷ 18.
Example scenario
A1C 6.5% ↔ eAG about 140 mg/dL (7.8 mmol/L).
FAQ
Is this my lab A1C?
No. It’s a conversion formula.
Why doesn’t my CGM match?
CGM averages and A1C measure different things; anemia and other factors shift A1C.
Diagnosis?
Clinicians use lab criteria, not this webpage.