Estimated Average Glucose (eAG) Calculator
Understand your HbA1c in daily sugar terms. This tool converts your long-term HbA1c percentage into the average daily blood glucose numbers you see on your meter.
What Is an Estimated Average Glucose (eAG) Calculator?
An Estimated Average Glucose (eAG) calculator converts your HbA1c value into an average daily blood glucose level. In simple words:
Long-term blood sugar average measured over 2–3 months.
What that HbA1c means in day-to-day glucose numbers (mg/dL or mmol/L).
Why eAG Is More Understandable Than HbA1c
HbA1c can feel abstract. Most people ask:
“My HbA1c is 6.8… is that bad? What does this mean for my daily sugar levels?”
eAG makes it real and relatable. It answers the question: “On average, what has my blood sugar been every day?”
Formula for mg/dL
eAG = (28.7 × HbA1c) − 46.7
Formula for mmol/L
eAG = (1.59 × HbA1c) − 2.59
Example Calculation
If your HbA1c = 7.0%:
eAG = (28.7 × 7) − 46.7 = 154 mg/dL.
This means your average blood sugar over 2–3 months was approximately 154 mg/dL.
Estimated Average Glucose Range by HbA1c
| HbA1c (%) | eAG (mg/dL) | Meaning |
|---|---|---|
| 5.0 | 97 | Normal |
| 5.5 | 111 | Healthy |
| 5.7 | 117 | Prediabetes starts |
| 6.0 | 126 | Prediabetes |
| 6.5 | 140 | Diabetes threshold |
| 7.0 | 154 | Diabetes (controlled) |
| 8.0 | 183 | Poor control |
| 9.0 | 212 | High risk |
eAG vs Finger-Stick
Finger-stick glucose: Sugar at one specific moment.
eAG: The big picture 2–3 month average.
HbA1c: The long-term chemical exposure percentage.
Why they may differ
- Frequent post-meal spikes
- Missed high readings during the day
- Night-time glucose rises
- Anemia or hemoglobin variants
Who Should Use This?
Ideal for those who:
- Have Diabetes or Prediabetes
- Monitor HbA1c regularly
- Want clear, relatable sugar data
Medical Note
eAG is valid for most adults. However, in children, pregnancy, anemia, or kidney disease, HbA1c may be misleading. Always interpret these results with medical context.
What to Do With Your eAG Result
Normal (<117)
Maintain your current lifestyle and schedule an annual HbA1c check.
Prediabetes (117–139)
Reduce sugar, increase activity, and recheck in 3–6 months.
High (≥140)
Consult a doctor for medication and lifestyle adjustments.
Common Myths About eAG & HbA1c
"HbA1c shows today's sugar" — False
"eAG replaces glucose testing" — False
"Normal fasting sugar means no diabetes" — False
Worried about your risk?
If your eAG is high, use our Diabetes Risk Calculator to assess your overall risk level.