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Your A1c Chart Explained: Convert Your A1c to an Average Blood Sugar Level (eAG)

04 Sep 2025 by M. Regina Castro, M.D.

Your A1c Chart Explained: Convert Your A1c to an Average Blood Sugar Level (eAG)

Understanding your A1c level is crucial for managing diabetes and prediabetes. It provides a snapshot of your average blood sugar levels over the past 2-3 months. This article breaks down what an A1c chart is, how to interpret your A1c results, and how to convert your A1c into an estimated Average Glucose (eAG) level. We'll also cover healthy A1c ranges, factors that can affect your A1c, and what to do with this information.

What is A1c?

A1c, also known as hemoglobin A1c or HbA1c, is a blood test that measures your average blood sugar (glucose) levels over the past 2-3 months. It works by measuring the percentage of your red blood cells that have glucose attached to them. The higher your average blood sugar levels, the more glucose will be attached to your red blood cells, and the higher your A1c will be. Unlike a daily blood sugar check, which provides a snapshot of your blood sugar at that specific moment, the A1c test offers a broader view of your blood sugar control over time. This makes it a valuable tool for diagnosing and managing diabetes.

Why is A1c Important?

The A1c test is a key indicator for:

  • Diagnosing Diabetes: A high A1c can confirm a diagnosis of type 2 diabetes or prediabetes.
  • Monitoring Diabetes Management: It helps assess how well your current treatment plan is working to control your blood sugar levels.
  • Predicting Long-Term Complications: Consistently high A1c levels increase your risk of developing long-term diabetes complications, such as nerve damage (neuropathy), kidney disease (nephropathy), eye damage (retinopathy), and cardiovascular disease. Regular A1c testing helps identify and address these risks early.

Understanding Your A1c Chart and eAG

The A1c chart links your A1c percentage to an estimated Average Glucose (eAG) level, which is presented in milligrams per deciliter (mg/dL). This eAG is essentially an estimate of what your average daily blood sugar has been. Using the chart allows you to relate your A1c back to the kind of numbers you might see on a regular glucose meter.

Here’s a simplified breakdown:

  • Lower A1c = Lower Average Blood Sugar: A lower A1c percentage indicates better blood sugar control.
  • Higher A1c = Higher Average Blood Sugar: A higher A1c percentage suggests that your blood sugar levels are consistently elevated.

A1c to eAG Conversion Chart

Here's how you can roughly convert your A1c to an estimated Average Glucose (eAG) level. Please note that these are estimations, and individual results may vary. It's always best to discuss your specific results with your doctor.

A1c (%) Estimated Average Glucose (eAG) (mg/dL) Estimated Average Glucose (eAG) (mmol/L)
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 11.0
9.0 212 11.8
9.5 226 12.6
10.0 240 13.4
10.5 255 14.2
11.0 269 15.0
11.5 283 15.8
12.0 298 16.6

Note: mmol/L is the measurement used in some countries outside of the US. 1 mg/dL = 0.0555 mmol/L

A1c Target Ranges

What are the recommended A1c target ranges? Here's a general guide:

  • Normal: Below 5.7%
  • Prediabetes: 5.7% to 6.4%
  • Diabetes: 6.5% or higher

For people diagnosed with diabetes, the target A1c level is generally below 7%, but this can vary based on individual circumstances, such as age, overall health, and the presence of other health conditions. Your doctor will determine the most appropriate A1c target for you. For some individuals, a slightly higher A1c target might be acceptable. The Hidden Connection Between Stress And Your Blood Sugar

Factors That Can Affect A1c Accuracy

While A1c is a reliable test, certain factors can influence its accuracy:

  • Anemia: Certain types of anemia can falsely lower or raise A1c results.
  • Hemoglobin Variants: Some hemoglobin variants (abnormal types of hemoglobin) can interfere with the A1c test.
  • Kidney Disease: Kidney disease can affect red blood cell turnover and influence A1c levels.
  • Pregnancy: Pregnancy can also impact A1c results.

If any of these conditions are present, your doctor might consider using alternative blood glucose measurements to monitor your blood sugar control. The Dangers Of High Blood Sugar Why Managing Glucose Is Critical

What to Do With Your A1c Results

Knowing your A1c and its correlation with your eAG empowers you to take control of your diabetes management. Here's what to do with your A1c results: What Is An Oral Glucose Tolerance Test Ogtt And Why Do You Need One

  1. Discuss with Your Doctor: Always discuss your A1c results with your healthcare provider. They can interpret the results in the context of your overall health and medical history.
  2. Adjust Your Treatment Plan (if needed): If your A1c is above the target range, your doctor might adjust your medication, diet, or exercise plan.
  3. Monitor Regularly: Follow your doctor's recommendations for A1c testing frequency, typically every 3-6 months. Regular monitoring is crucial for effective diabetes management.
  4. Make Lifestyle Changes: If you have prediabetes or diabetes, focus on making healthy lifestyle changes, such as adopting a balanced diet, engaging in regular physical activity, and maintaining a healthy weight. These changes can significantly improve your blood sugar control and lower your A1c.

Improving Your A1c Level

Improving your A1c level often involves a combination of lifestyle modifications and medical interventions. Here are some key strategies:

  • Diet: Follow a balanced meal plan that includes plenty of fruits, vegetables, whole grains, and lean protein. Limit sugary drinks, processed foods, and excessive carbohydrates. Consider consulting a registered dietitian or certified diabetes educator for personalized meal planning advice.
  • Exercise: Engage in regular physical activity, aiming for at least 150 minutes of moderate-intensity exercise per week. Activities like brisk walking, swimming, and cycling can improve insulin sensitivity and lower blood sugar levels.
  • Medication: If lifestyle changes are not enough to control your blood sugar, your doctor might prescribe medication, such as metformin, sulfonylureas, or insulin. Take your medications as prescribed and monitor your blood sugar levels regularly.
  • Stress Management: Stress can raise blood sugar levels. Practice stress-reducing techniques, such as meditation, yoga, or deep breathing exercises.
  • Regular Monitoring: Check your blood sugar levels regularly as advised by your doctor and keep track of your results. This will help you understand how your body responds to different foods, activities, and medications.

Conclusion

Understanding your A1c level and its equivalent eAG is vital for effective diabetes management. By working closely with your healthcare team, making healthy lifestyle choices, and monitoring your A1c regularly, you can take control of your blood sugar and reduce your risk of diabetes complications. The A1c test provides valuable insights that can help you live a healthier life. Remember, every small step towards a healthier lifestyle contributes to better A1c control and overall well-being.

References and Further Reading