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
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
- 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 Blood Sugar Conversion Calculator or Insulin Correction Dose Calculator.
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.
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.
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I can help you understand the hba1c to eag calculator formula, interpret your results, and answer follow-up questions.
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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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