A1c to Average Glucose (eAG)
eAG (mg/dL) = 28.7 × A1c − 46.7 — the ADAG study formula used by the American Diabetes Association.
A1c to eAG chart
| A1c (%) | eAG (mg/dL) | eAG (mmol/L) |
|---|---|---|
| 5 | 97 | 5.4 |
| 5.5 | 111 | 6.2 |
| 6 | 125 | 7.0 |
| 6.5 | 140 | 7.8 |
| 7 | 154 | 8.6 |
| 7.5 | 169 | 9.4 |
| 8 | 183 | 10.2 |
| 8.5 | 197 | 11.0 |
| 9 | 212 | 11.8 |
| 9.5 | 226 | 12.6 |
| 10 | 240 | 13.4 |
| 11 | 269 | 14.9 |
| 12 | 298 | 16.5 |
Formula: Nathan DM et al., "Translating the A1C assay into estimated average glucose values," Diabetes Care 2008;31(8):1473–1478 (ADAG study).
This converts between measures; it doesn't interpret them. Related: blood sugar mg/dL ⇄ mmol/L.
FAQ
What is the formula to convert A1c to average glucose?
Estimated average glucose (eAG) in mg/dL = 28.7 × A1c − 46.7. In mmol/L: eAG = 1.59 × A1c − 2.59.
What average glucose is an A1c of 7%?
About 154 mg/dL (about 8.5–8.6 mmol/L depending on rounding), using 28.7 × 7 − 46.7.
Where does the formula come from?
From the A1c-Derived Average Glucose (ADAG) study (Nathan et al., Diabetes Care, 2008), which compared A1c with continuous glucose monitoring; the American Diabetes Association uses it for eAG.
Is eAG the same as my meter average?
Not exactly. eAG is a statistical estimate from A1c; meter or CGM averages depend on when readings are taken. Individual results can differ from the estimate.
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