Estimated Average Glucose Calculator

Category: Diabetes
- April 07, 2025
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This calculator converts between HbA1c (A1C) values and Estimated Average Glucose (eAG). It helps patients and healthcare providers understand the relationship between A1C test results and average blood glucose levels over the past 2-3 months.

Conversion Calculator

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OR

Display Options

Conversion Results

HbA1c (A1C)
7.0
%
eAG (mg/dL)
154
mg/dL
eAG (mmol/L)
8.6
mmol/L

Conversion Formula

A1C to eAG (mg/dL):
eAG (mg/dL) = (28.7 × A1C) - 46.7
eAG (mg/dL) to A1C:
A1C (%) = (eAG + 46.7) ÷ 28.7

This formula is based on the ADAG (A1C-Derived Average Glucose) study and is the standard used by the American Diabetes Association.

Interpretation of Results

An A1C of 7.0% indicates an estimated average glucose level of 154 mg/dL (8.6 mmol/L) over the past 2-3 months.

For most adults with diabetes, the American Diabetes Association suggests an A1C target of less than 7%, which corresponds to an estimated average glucose of less than 154 mg/dL (8.6 mmol/L).

A1C to eAG Reference Table

A1C (%) eAG (mg/dL) eAG (mmol/L)
5.0 97 5.4
5.5 111 6.2
6.0 126 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 11.8
9.5 226 12.6
10.0 240 13.4
11.0 269 14.9
12.0 298 16.5

About HbA1c and eAG

Hemoglobin A1c (HbA1c or A1C) measures the percentage of hemoglobin proteins in your blood that are coated with glucose. It reflects your average blood glucose levels over the past 2-3 months.

Why Use eAG?

Estimated Average Glucose (eAG) converts the A1C percentage into the same units used in daily blood glucose monitoring (mg/dL or mmol/L). This makes it easier for patients to understand the relationship between their A1C results and daily glucose readings.

Target A1C Levels
  • General Adults with Diabetes: Less than 7.0%
  • Without Significant Hypoglycemia Risk: Around 6.5%
  • With History of Severe Hypoglycemia, Limited Life Expectancy, or Multiple Comorbidities: Less than 8.0%
  • Non-Diabetic Reference Range: 4.0% to 5.6%

Individual A1C targets should be personalized based on age, comorbidities, diabetes duration, hypoglycemia risk, and patient preferences.

Limitations

Some conditions may affect A1C results, including anemia, certain hemoglobin variants, recent blood loss or transfusions, and pregnancy. Your healthcare provider should interpret A1C results in context with your overall health status.

Disclaimer: This calculator provides an estimate of the relationship between A1C and average glucose based on population studies. Individual results may vary. Always discuss your diabetes management with your healthcare provider.

What Is the Estimated Average Glucose (eAG) Calculator?

The Estimated Average Glucose Calculator helps you understand how your HbA1c (A1C) test result relates to your average blood sugar levels over time. Whether you're using it as an A1C calculator or as an eAG to A1C conversion tool, it provides clarity on what those numbers mean in everyday terms.

This tool is particularly helpful for people managing diabetes, as it bridges the gap between lab results and daily glucose monitoring.

Conversion Formulas Used

A1C to eAG (mg/dL): eAG = (28.7 × A1C) − 46.7
eAG (mg/dL) to A1C: A1C = (eAG + 46.7) ÷ 28.7

How to Use the Calculator

You can use this tool to convert A1C to estimated average glucose or vice versa. It's easy and fast. Here's how:

  • To convert A1C to eAG: Enter your HbA1c percentage (e.g., 7.0%) and click "Convert to eAG".
  • To convert eAG to A1C: Input your average glucose value in either mg/dL or mmol/L and select the unit. Then click "Convert to A1C".
  • You can also adjust the number of decimal places displayed or choose to show both mg/dL and mmol/L results.
  • Use the "Clear Values" button to reset everything and start fresh.

Why This Calculator Matters

Understanding your A1C results is essential for managing diabetes. However, many find it easier to relate to average blood glucose numbers seen on daily glucose monitors. This tool converts those numbers so they’re easier to grasp.

Here’s how it helps:

Understanding the Results

Once you perform a calculation, the tool displays the result in both A1C (%) and eAG (in mg/dL and mmol/L). It also gives a clear interpretation based on clinical guidelines:

  • Below 5.7% A1C: Normal range
  • 5.7%–6.4% A1C: Prediabetes
  • 6.5% or higher A1C: Diabetes range

These ranges help users evaluate where they stand and understand what their values mean in context.

FAQs

1. What is eAG?

eAG stands for Estimated Average Glucose. It translates your A1C result into average daily blood sugar levels.

2. How accurate is this conversion?

The calculator uses formulas derived from the ADAG (A1C-Derived Average Glucose) study. While it's a reliable guide, individual variations can occur.

3. What units does the calculator support?

The calculator supports both mg/dL (common in the U.S.) and mmol/L (used in many other countries).

4. Can I use this instead of a lab test?

No, this is a tool to help interpret lab results—not replace them. Always consult your healthcare provider for medical advice.

5. Is this calculator useful if I already monitor my blood sugar daily?

Yes! It helps relate your long-term A1C value to daily glucose readings, providing a bigger picture of your glycemic control.

Final Thoughts

Whether you’re checking your A1C from eAG values or exploring estimated glucose to A1C relationships, this tool offers a quick and clear solution. It’s a helpful resource for anyone managing blood sugar levels or supporting others in their diabetes journey.

If you're using other tools like a HOMA-IR calculator, insulin dosage tool, or a blood sugar conversion calculator, this estimated average glucose calculator fits right into your toolkit for informed diabetes care.