A1C to Average Glucose Conversion Examples
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Full bio →Seeing the ADAG formula applied to real numbers makes it easier to understand what an A1C result actually means in glucose terms. Below are five worked examples spanning the normal, prediabetes, and diabetes ranges, each converted to eAG in mg/dL and mmol/L and to IFCC mmol/mol. The formulas behind these conversions are explained in full in the A1C, eAG & ADAG formula glossary.
The Formulas Used
eAG (mg/dL) = 28.7 × A1C − 46.7
eAG (mmol/L) = eAG (mg/dL) ÷ 18.0182
IFCC (mmol/mol) = (A1C% − 2.15) × 10.929Example 1 — A1C 5.5% (Normal Range)
- eAG (mg/dL): 28.7 × 5.5 − 46.7 = 111.1 mg/dL
- eAG (mmol/L): 111.1 ÷ 18.0182 = 6.17 mmol/L
- IFCC: (5.5 − 2.15) × 10.929 = 36.6 mmol/mol
This falls comfortably under the 5.7% prediabetes threshold — no indication of diabetes or prediabetes from this result alone.
Example 2 — A1C 6.0% (Prediabetes Range)
- eAG (mg/dL): 28.7 × 6.0 − 46.7 = 125.5 mg/dL
- eAG (mmol/L): 125.5 ÷ 18.0182 = 6.97 mmol/L
- IFCC: (6.0 − 2.15) × 10.929 = 42.1 mmol/mol
This lands in the 5.7%–6.4% prediabetes band. The ADA recommends lifestyle intervention and re-testing at least annually at this level — see ADA A1C diagnostic ranges explained for the full breakdown.
Example 3 — A1C 6.5% (Diabetes Threshold)
- eAG (mg/dL): 28.7 × 6.5 − 46.7 = 139.8 mg/dL
- eAG (mmol/L): 139.8 ÷ 18.0182 = 7.76 mmol/L
- IFCC: (6.5 − 2.15) × 10.929 = 47.5 mmol/mol
This is the exact cutoff the ADA uses to diagnose diabetes, typically requiring confirmation with a second test on a separate day.
Example 4 — A1C 7.0% (Common Treatment Target)
- eAG (mg/dL): 28.7 × 7.0 − 46.7 = 154.2 mg/dL
- eAG (mmol/L): 154.2 ÷ 18.0182 = 8.56 mmol/L
- IFCC: (7.0 − 2.15) × 10.929 = 53.0 mmol/mol
An A1C of 7.0% is the ADA’s commonly cited general target for many non-pregnant adults already managing diabetes, though individual targets vary by age, other health conditions, and hypoglycemia risk.
Example 5 — A1C 9.0% (Elevated / Poorly Controlled)
- eAG (mg/dL): 28.7 × 9.0 − 46.7 = 211.6 mg/dL
- eAG (mmol/L): 211.6 ÷ 18.0182 = 11.75 mmol/L
- IFCC: (9.0 − 2.15) × 10.929 = 74.9 mmol/mol
An A1C this high indicates average glucose well above target and typically prompts a treatment plan change and closer follow-up — often quarterly re-testing rather than the twice-a-year schedule used for stable results.
Summary Table
| A1C | eAG (mg/dL) | eAG (mmol/L) | IFCC (mmol/mol) | ADA category |
|---|---|---|---|---|
| 5.5% | 111.1 | 6.17 | 36.6 | Normal |
| 6.0% | 125.5 | 6.97 | 42.1 | Prediabetes |
| 6.5% | 139.8 | 7.76 | 47.5 | Diabetes (threshold) |
| 7.0% | 154.2 | 8.56 | 53.0 | Diabetes (common target) |
| 9.0% | 211.6 | 11.75 | 74.9 | Diabetes (elevated) |
Try Your Own Number
These five examples cover common reference points, but your own result is unlikely to land on a round number. Enter your exact A1C, mg/dL, mmol/L, or IFCC value into the A1C calculator to get a precise conversion across all four formats at once, along with where it falls on the ADA scale.
If a result surprised you, or didn’t match what a home glucose meter has been showing, review common mistakes interpreting A1C and eAG results — unit mix-ups and conditions that affect A1C accuracy are frequent culprits.