HbA1c to eAG Calculator
Convert your HbA1c percentage to the Estimated Average Glucose (eAG), showing the value in mg/dL or mmol/L.
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Formula
How it works: Allows patients to relate their 3-month A1c average to the daily readings they see on their glucose meters.
Worked Example
Understanding HbA1c and Estimated Average Glucose
HbA1c measures the percentage of hemoglobin proteins that are glycated (coated with sugar). Because red blood cells live about 120 days, A1c reflects average blood sugar over 2 to 3 months. The eAG conversion puts this lab value into the same units patients see on their glucose meters.
- Formula: eAG (mg/dL) = 28.7 x A1c - 46.7, derived from the A1c-Derived Average Glucose (ADAG) study
- Normal A1c: below 5.7%. Prediabetes: 5.7% to 6.4%. Diabetes: 6.5% or higher
- ADA target for most adults with diabetes: A1c below 7% (eAG below 154 mg/dL)
- A1c of 7% corresponds to eAG of 154 mg/dL or 8.6 mmol/L
- Conditions like anemia or hemoglobin variants can affect A1c accuracy
This calculator is for educational reference only. Discuss your individual A1c target with your healthcare provider.
You can also calculate changes using our Diabetes Carb Calculator, Blood Sugar Conversion Calculator, Kidney Health and CKD Risk Calculator or Insulin Correction Dose Calculator.
HbA1c to Estimated Average Glucose (eAG) Conversion Chart
Convert HbA1c percentage to estimated average blood glucose in mg/dL and mmol/L. Based on the ADAG study formula: eAG = 28.7 x A1c - 46.7.
| HbA1c (%) | eAG (mg/dL) | eAG (mmol/L) | Clinical Interpretation |
|---|---|---|---|
| 5.0% | 97 | 5.4 | Normal (non-diabetic) |
| 5.5% | 111 | 6.2 | Normal |
| 5.7% | 117 | 6.5 | Prediabetes threshold |
| 6.0% | 126 | 7.0 | Prediabetes |
| 6.5% | 140 | 7.8 | Diabetes diagnosis threshold |
| 7.0% | 154 | 8.6 | Typical treatment target for most diabetics |
| 8.0% | 183 | 10.2 | Above target, treatment adjustment needed |
| 9.0% | 212 | 11.8 | Poorly controlled, complication risk increases |
| 10.0% | 240 | 13.3 | High risk, urgent management needed |
| 11.0% | 269 | 14.9 | Very high risk |
| 12.0% | 298 | 16.5 | Critically elevated |
Note: eAG represents the average blood glucose over approximately 2 to 3 months. The ADA recommends an A1c target below 7% for most adults with diabetes. Individual targets may vary. Conditions like anemia, hemoglobin variants, and recent blood transfusions can affect A1c accuracy. For educational reference only.
Frequently Asked Questions
What is eAG?
eAG stands for Estimated Average Glucose. It translates your A1c percentage into the same mg/dL or mmol/L units you see on a daily glucose meter, making lab results easier to understand.
How is eAG calculated from HbA1c?
The formula is eAG (mg/dL) = 28.7 x A1c - 46.7. For example, an A1c of 7.0% equals an eAG of about 154 mg/dL, and an A1c of 6.0% equals roughly 126 mg/dL.
What is a good A1c target?
The American Diabetes Association recommends an A1c below 7% (eAG below 154 mg/dL) for most adults with diabetes, though individualized targets may be higher or lower depending on age and health status.
How often should A1c be tested?
Most guidelines recommend testing every 3 months for patients not meeting targets and every 6 months for those with stable glucose control.
Can eAG replace daily glucose monitoring?
No. eAG represents a 2 to 3 month average and does not capture daily highs and lows. Continuous or fingerstick monitoring is still essential for adjusting insulin and preventing hypoglycemia.
What A1c level indicates prediabetes?
An A1c between 5.7% and 6.4% (eAG 117 to 137 mg/dL) is considered prediabetes. An A1c of 6.5% or higher on two separate tests indicates diabetes.
Can I embed this HbA1c to eAG Calculator on my website?
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Medical Disclaimer
This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.
AI Assistant
Ask about this calculator
I can help you understand the hba1c to eag calculator formula, interpret your results, and answer follow-up questions.
Try asking
Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.
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