Enter your Hemoglobin A1c (HbA1c) value to estimate your estimated average glucose (eAG) in mg/dL (or mmol/L) using a commonly used population-based equation.
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.
eAG_{mg/dL} = (HbA1c \times 28.7) - 46.7Variables:
- 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.
For background on HbA1c and estimated average glucose (eAG), check patient and clinician guidance from reputable sources such as the American Diabetes Association (ADA) and the CDC.
| 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 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).
