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.
Calqulate.net converts your HbA1c into estimated average glucose using the recognised ADAG formula. You get an accurate everyday glucose figure in both mg/dL and mmol/L with clear targets.
A1C → eAG
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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.
Tracking HbA1c During GLP-1 Therapy
Your HbA1c is essentially a roughly 3-month average of your blood sugar, because glucose slowly attaches to the hemoglobin in your red blood cells, and those cells live for about three months. That is a useful number, but a percentage can feel abstract. This is exactly what the eAG figure above is for. It turns your A1c into an everyday glucose reading in mg/dL or mmol/L, the same kind of number you would see on your meter, so the average is easier to picture.
If you are on a GLP-1 medication, this is worth understanding. GLP-1 therapy, often alongside gradual weight loss, frequently helps lower A1c and eAG over time by improving how your body handles glucose and by reducing appetite. That said, results genuinely vary from person to person, and how much your numbers move depends on your starting point, your other medications, your diet, and your activity. GLP-1 medicines are one tool among several, not a guarantee, so it is best to follow the plan your clinician sets for you rather than expecting a specific result.
Watch the trend, not one reading
Because A1c reflects months of blood sugar, a single result is only a snapshot. Recheck it on whatever schedule your clinician recommends, which is often every three to six months when things are changing, and then look at the direction your A1c and eAG are heading across several tests. A steady downward trend usually tells you more than any one value. If a reading surprises you or your numbers are not moving the way you expected, bring it to your care team rather than adjusting anything on your own. You can also compare each new A1c against the diabetes risk calculator to keep the bigger picture in view.
Track Your A1c Over Time
Keep your lab results in one place so you can watch the long-term trend, not just today's number.
Related Disease Risk Calculators
Explore the rest of our disease risk tools — each one adds a different piece of the picture.
Frequently Asked Questions
Tool Information
July 24, 2026
Dr. Jaydeep Sanghani
Meet Akabari
Dr. Jaydeep Sanghani
MBBS, MD, DNB(Anaesth.), PDCC(CCM), DrNB(CCM)
AIIMS Bhubaneswar · AIIMS Rishikesh
Critical care specialist and anesthesiologist with advanced training from AIIMS. Reviews health calculators at Calqulate to ensure medical accuracy and evidence-based standards.
About the authors
Meet Akabari
·Co-Founder, Calqulate.net