Estimated Average Glucose Calculator

- May 09, 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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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 Hypoglycaemia Risk: Around 6.5%
  • With History of Severe Hypoglycaemia, Limited Life Expectancy, or Multiple Comorbidities: Less than 8.0%
  • Non-Diabetic Reference Range: 4.0% to 5.6%

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

Limitations

Some conditions may affect A1C results, including anaemia, 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 Calculator?

The Estimated Average Glucose Calculator is a handy tool for anyone looking to understand the link between their HbA1c (A1C) levels and their average blood glucose. By inputting either A1C values or estimated average glucose (eAG), users can see how their long-term blood sugar control corresponds to daily readings. This is especially useful for patients managing Diabetes and healthcare providers who want to monitor their patients’ progress.

Why Use This Calculator?

This calculator simplifies the process of converting between A1C and eAG. It helps users grasp their blood glucose levels without needing to understand complex medical jargon. Here are a few reasons to use this tool:

  • Quick conversions between A1C and eAG.
  • Clear insights into average glucose levels over the past 2-3 months.
  • Helps in tracking diabetes management and progress.

Understanding HbA1c and eAG

HbA1c, or A1C, measures how much glucose is attached to hemoglobin in your blood. It gives a good indication of average blood sugar levels over the past few months. On the Other hand, Estimated Average Glucose (eAG) presents this information in the same units used for daily glucose monitoring, making it easier to relate A1C results to everyday blood sugar readings.

How to Use the EAG Calculator

Using the Estimated Average Glucose Calculator is straightforward. You can either enter your A1C percentage or your eAG value. The calculator will then provide you with the corresponding value in the other unit. This allows users to easily compare their results without confusion.

What Are the Normal Ranges?

Understanding normal ranges for A1C and eAG is crucial for effective diabetes management. Here’s a quick summary of these ranges:

  • A1C less than 5.7% is normal.
  • A1C between 5.7% and 6.4% indicates prediabetes.
  • A1C of 6.5% or higher suggests diabetes.

Advanced Options for Precision

This calculator also offers advanced options to customise the display of results. Users can choose the number of decimal places for A1C and eAG values, ensuring results meet their preferences. Additionally, users can opt to display eAG in both mg/dL and mmol/L, accommodating different measurement systems.

Interpreting Your Results

Once you receive your results, it’s essential to interpret them accurately. An A1C of 7.0% correlates to an average glucose of 154 mg/dL or 8.6 mmol/L. Most adults aim for an A1C of less than 7% to effectively manage their diabetes. Understanding your results can help you make informed decisions about your Health and treatment.

Limitations and Considerations

While this calculator is a valuable tool, it’s important to remember that some conditions can affect A1C results. Factors like anaemia or recent blood transfusions may influence readings. Always consult with your healthcare provider to interpret your A1C and eAG results within the context of your overall health.