HbA1c to Average Glucose Calculator
Enter your HbA1c to see which ADA category it falls in and your estimated average glucose over the past few months.
| Result | Interpretation |
|---|---|
| Below 5.7% | Normal |
| 5.7% to 6.5% | Prediabetes |
| 6.5% and above | Diabetes range |
Source: Nathan DM, Kuenen J, Borg R, et al. Translating the A1C assay into estimated average glucose values. Diabetes Care 2008;31(8):1473-1478. (doi:10.2337/dc08-0545)
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A1c to average glucose chart
| A1c | Average glucose (mg/dL) | Average glucose (mmol/L) |
|---|---|---|
| 5.0% | 97 | 5.4 |
| 5.5% | 111 | 6.2 |
| 5.7% | 117 | 6.5 |
| 6.0% | 125 | 7.0 |
| 6.5% | 140 | 7.8 |
| 7.0% | 154 | 8.6 |
| 7.5% | 169 | 9.4 |
| 8.0% | 183 | 10.2 |
| 9.0% | 212 | 11.8 |
| 10.0% | 240 | 13.4 |
| 11.0% | 269 | 14.9 |
| 12.0% | 298 | 16.5 |
Values use the ADAG formula: average glucose (mg/dL) = 28.7 × A1c − 46.7. Below 5.7% is normal, 5.7% to 6.4% is prediabetes, and 6.5% or above is in the diabetes range.
To gauge central fat and metabolic risk, see the waist-to-height ratio calculator.
FAQs
What does HbA1c measure?
HbA1c reflects your average blood sugar over roughly the past two to three months. The ADA categories are below 5.7% normal, 5.7% to 6.4% prediabetes, and 6.5% or above in the diabetes range.
What is estimated average glucose (eAG)?
eAG translates your A1c into the same units as a glucose meter. It uses the ADAG study formula, estimated average glucose in mg/dL equals 28.7 times your A1c minus 46.7.
Does a single high A1c diagnose diabetes?
No. A diagnosis usually needs confirmation, for example a repeat test, and is made by your physician in the context of your full picture.