Convert HbA1c to mg/dL estimated average glucose (eAG) with the ADAG formula. Enter HbA1c in % or mmol/mol, or convert mg/dL back to HbA1c.
Medical disclaimer: This calculator estimates average glucose (eAG) from HbA1c using a population-based equation and is for informational purposes only. It is not medical advice and should not be used to diagnose diabetes or to make medication/insulin changes—review results with a qualified clinician.
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HbA1c to eAG (mg/dL) Formula
The following formula is used to estimate average glucose (eAG) from HbA1c.
Variables:
- eAG is the estimated average glucose (mg/dL)
- HbA1c is the hemoglobin A1c value (%)
To estimate average glucose (eAG) in mg/dL, multiply HbA1c (%) by 28.7, then subtract 46.7 from the result.
The NGSP explanation of HbA1c and eAG describes the ADAG population regression. Individual relationships vary; anemia, altered red-cell survival and some hemoglobin variants can interfere. The reverse estimate is not a laboratory HbA1c measurement or CGM-derived GMI.
| HbA1c (%) | eAG (mg/dL) | eAG (mmol/L) |
|---|---|---|
| 4.0 | 68.10 | 3.78 |
| 4.5 | 82.45 | 4.58 |
| 5.0 | 96.80 | 5.38 |
| 5.5 | 111.15 | 6.18 |
| 6.0 | 125.50 | 6.97 |
| 6.5 | 139.85 | 7.77 |
| 7.0 | 154.20 | 8.57 |
| 7.5 | 168.55 | 9.36 |
| 8.0 | 182.90 | 10.16 |
| 8.5 | 197.25 | 10.96 |
| 9.0 | 211.60 | 11.76 |
| 9.5 | 225.95 | 12.55 |
| 10.0 | 240.30 | 13.35 |
| 10.5 | 254.65 | 14.15 |
| 11.0 | 269.00 | 14.94 |
| 11.5 | 283.35 | 15.74 |
| 12.0 | 297.70 | 16.54 |
| 12.5 | 312.05 | 17.34 |
| 13.0 | 326.40 | 18.13 |
| 13.5 | 340.75 | 18.93 |
| eAG (mg/dL) = 28.7 × HbA1c(%) − 46.7. To convert mg/dL to mmol/L, divide by the rounded clinical factor 18. Values rounded to 2 decimal places. | ||
What is HbA1c to eAG (mg/dL)?
HbA1c to mg/dL in this context refers to translating an HbA1c percentage into an estimated average glucose (eAG) value expressed in mg/dL (or mmol/L). HbA1c is a blood test used to assess longer-term glucose control (often described as reflecting the prior 2–3 months), and eAG is a way to express that longer-term estimate in glucose-style units.
How to Calculate HbA1c to eAG?
The following steps outline how to estimate average glucose (eAG) using the formula: eAG = (HbA1c × 28.7) − 46.7
- First, determine the HbA1c level (%).
- Next, multiply the HbA1c level by 28.7.
- Then, subtract 46.7 from the result.
- Finally, the result is the estimated average glucose (eAG) in mg/dL (convert to mmol/L by dividing by 18).
- After inserting the HbA1c level and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
HbA1c level (%) = 7.2
Estimated average glucose (eAG) = (7.2 × 28.7) − 46.7 = 159.94 mg/dL (≈ 8.89 mmol/L).
