A1C Calculator: Convert A1C to Average Glucose (eAG)
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Estimated average glucose in mg/dL is 28.7 × A1C − 46.7. An A1C of 7% matches an average glucose of about 154 mg/dL (8.6 mmol/L).
An A1C of 7.0% matches an estimated average glucose of about 154 mg/dL (8.6 mmol/L). The American Diabetes Association places that in the diabetes range (6.5% or higher).
A1C to average glucose
| A1C | mg/dL | mmol/L |
|---|---|---|
| 5.0% | 97 | 5.4 |
| 5.5% | 111 | 6.2 |
| 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 |
| 8.5% | 197 | 10.9 |
| 9.0% | 212 | 11.7 |
| 9.5% | 226 | 12.5 |
| 10.0% | 240 | 13.3 |
| 10.5% | 255 | 14.1 |
| 11.0% | 269 | 14.9 |
| 11.5% | 283 | 15.7 |
| 12.0% | 298 | 16.5 |
Show the steps
- Average glucose (mg/dL) = 28.7 × 7.00 − 46.7 = 154.2.
- mmol/L = mg/dL ÷ 18.016 = 8.56.
A1C and estimated average glucose (ADAG)
eAG (mg/dL) = 28.7 × A1C − 46.7
eAG (mmol/L) = 1.59 × A1C − 2.59
- Estimated average glucose is calculated from a large study. Your own meter readings can differ, and some conditions change A1C accuracy.
- Ranges: below 5.7% normal, 5.7% to 6.4% prediabetes, 6.5% or higher diabetes (American Diabetes Association). A diagnosis needs a doctor’s tests.
Estimates for planning and learning, not financial, tax, legal or medical advice. Check figures with your lender, tax preparer or doctor before you act.
About this calculator
A1C reflects your average blood sugar over the last two to three months. Home meters report glucose in mg/dL or mmol/L, so the two are hard to compare. This calculator converts between them with the formula from the ADAG study used by the American Diabetes Association.
It also shows where the number falls: normal, prediabetes or the diabetes range.
How to use it
- Choose to convert from A1C to glucose, or from glucose to A1C.
- Enter the value. For glucose, pick mg/dL or mmol/L.
- Read the result and the range, and check the table.
A1C ranges
- Below 5.7%: normal.
- 5.7% to 6.4%: prediabetes.
- 6.5% or higher: diabetes range.
Many adults with diabetes aim for an A1C below 7%, but your own target should come from your doctor.
Sources
Quick check: test yourself
An A1C of 7% matches an average glucose of about…
Correct answer: 154 mg/dL. 28.7 × 7 − 46.7 = 154.2.
An A1C between 5.7% and 6.4% is in the…
Correct answer: Prediabetes range. ADA places 5.7% to 6.4% in the prediabetes range.
What time period does A1C reflect?
Correct answer: About 2 to 3 months. A1C reflects average glucose over roughly the past two to three months.
Pick an answer for each question.
Common questions
How do I convert A1C to average glucose?
Multiply the A1C by 28.7 and subtract 46.7 to get mg/dL.
What A1C is normal?
Below 5.7%.
What A1C means diabetes?
6.5% or higher on two tests, or with other signs, is in the diabetes range.
Why does my meter average differ from my A1C?
A1C reflects the last two to three months and is weighted toward recent weeks. Meter averages cover the days you tested.
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