A1C Calculator
Convert A1C to estimated average glucose (eAG) in mg/dL and mmol/L, or convert glucose to A1C. Includes a chart and the standard ranges.
Advertisement
About the A1C Calculator
The A1C test measures the percentage of hemoglobin with glucose attached and reflects your average blood sugar over about 2 to 3 months. The estimated average glucose (eAG) expresses the same result in the units shown on a glucose meter. This calculator uses the standard formula eAG (mg/dL) = 28.7 × A1C − 46.7 to convert in both directions.
This tool is educational and does not replace medical advice. Ask your doctor what your A1C target should be.
How to use it
- Choose the conversion direction.
- Enter the A1C percentage or the average glucose, and pick the glucose unit.
- Press Convert to see the result and the matching A1C range.
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 |
| 9 | 212 | 11.7 |
| 10 | 240 | 13.3 |
| 11 | 269 | 14.9 |
| 12 | 298 | 16.5 |
A1C ranges (American Diabetes Association)
| Range | A1C |
|---|---|
| Normal | Below 5.7 % |
| Prediabetes | 5.7 % to 6.4 % |
| Diabetes | 6.5 % or higher |
Many adults with diabetes are given a general target below 7 %, but individual targets differ. Follow your care team’s advice.
Frequently asked questions
What is a normal A1C level?
Below 5.7 % is considered normal. 5.7 to 6.4 % is the prediabetes range and 6.5 % or higher is the diabetes range.
What does an A1C of 7 mean in average blood sugar?
An A1C of 7 % corresponds to an estimated average glucose of about 154 mg/dL (8.6 mmol/L).
How do I convert A1C to mg/dL?
Multiply A1C by 28.7 and subtract 46.7. For example 6.5 × 28.7 − 46.7 = 140 mg/dL.
How often should A1C be tested?
Often twice a year if levels are stable, and four times a year if treatment changes or goals are not met. Your doctor decides.
Why can eAG differ from my meter readings?
eAG is a statistical average linked to A1C. Daily meter readings vary with meals, activity and stress.
Last reviewed: November 2026. Educational only. Not medical advice; talk to your doctor about your results.
Advertisement