Nutrition
A1C to Glucose Calculator
Your A1C is a three-month report card for blood sugar. Convert it to the daily glucose numbers you see on your meter.
Estimated average glucose (eAG) links A1C to daily blood sugar: eAG (mg/dL) = 28.7 × A1C − 46.7. An A1C of 7% corresponds to about 154 mg/dL; under 5.7% is normal, and 6.5% or above indicates diabetes. Pair the target with whole foods and adjust based on your own progress and energy levels.
Normal: A1C < 5.7%.
Prediabetes: 5.7–6.4%.
Diabetes: ≥ 6.5%.
Calculate Your A1C to Glucose
Your A1C
What Is A1C to Glucose?
A1C (HbA1c) measures the percentage of hemoglobin with glucose attached, reflecting average blood sugar over the previous two to three months.
The ADA-endorsed equation converts A1C to estimated average glucose (eAG), expressed in mg/dL or mmol/L, the units shown on glucose meters.
How It Is Calculated
eAG (mg/dL) = 28.7 × A1C − 46.7
mmol/L = mg/dL ÷ 18
Example: Example: A1C 7.0% → eAG ≈ 154 mg/dL (8.6 mmol/L)
ADA A1C thresholds
| A1C | eAG (mg/dL) | Meaning |
|---|---|---|
| < 5.7% | < 117 | Normal |
| 5.7–6.4% | 117–137 | Prediabetes |
| ≥ 6.5% | ≥ 140 | Diabetes (with confirmation) |
| ≥ 7.0% | ≥ 154 | Common treatment target |
Limitations
- A1C can be misleading in anemia, pregnancy, and some hemoglobin variants.
- eAG is an average, it doesn't show highs and lows; CGM data does.
- Only a clinician can diagnose diabetes.
Sources & Review
References used for this calculator’s formulas and thresholds:
A1C to Glucose FAQ
What is a normal A1C?
Below 5.7%. Between 5.7% and 6.4% signals prediabetes; 6.5% or above on two tests indicates diabetes.
What does A1C 7 mean in glucose numbers?
An A1C of 7% equals an average glucose of about 154 mg/dL (8.6 mmol/L).
How often should A1C be checked?
At least twice a year when stable and in range, quarterly when therapy changes or targets aren't met.
Can I lower my A1C without medication?
Often yes in prediabetes — weight loss of 5–7%, 150 min/week of activity, and fewer refined carbs are the evidence-based levers.
Please read this first: these results are educational estimates, not medical advice. For decisions about your health, talk to a qualified professional.