A1C to Average Glucose (eAG) Converter
Enter an A1C percentage to estimate average blood glucose over the past ~2-3 months, using the ADA-published conversion formula.
Educational estimate, not a diagnosis. This result is general information only and does not replace advice from your doctor or diabetes care team. It does not provide medication or insulin dosing guidance. See our full medical disclaimer.
Formula and A1C category cutoffs: American Diabetes Association eAG calculator · NIDDK A1C test overview
Reference table: A1C, eAG, and category
| A1C | eAG (mg/dL) | eAG (mmol/L) | ADA category |
|---|---|---|---|
| 5.0% | 97 | 5.4 | Normal |
| 5.7% | 117 | 6.5 | Prediabetes (lower bound) |
| 6.5% | 140 | 7.8 | Diabetes (threshold) |
| 7.0% | 154 | 8.6 | Diabetes |
| 8.0% | 183 | 10.2 | Diabetes |
| 9.0% | 212 | 11.8 | Diabetes |
| 10.0% | 240 | 13.4 | Diabetes |
Category cutoffs (normal <5.7%, prediabetes 5.7-6.4%, diabetes ≥6.5%) per the ADA A1C guidance.
Frequently asked questions
What formula converts A1C to eAG?
The ADA-published formula is eAG (mg/dL) = 28.7 × A1C − 46.7. It's a statistical average derived from large patient studies, not a personal prediction.
Is eAG the same as a fingerstick or CGM reading?
No — eAG estimates your average glucose over roughly the past 2-3 months based on A1C, while a fingerstick or CGM reading shows glucose at a single moment. Learn more in fasting glucose vs. A1C.