HbA1c (glycated hemoglobin) reflects your average blood glucose over the past 2–3 months. It is reported as a percentage (e.g. 7%) and is used to monitor diabetes control.

What formula is used?

This calculator uses the American Diabetes Association formula: eAG (mg/dL) = 28.7 × HbA1c (%) − 46.7.

Estimated average glucose (eAG) is the average blood sugar level in mg/dL that corresponds to your HbA1c. It is for reference only; it does not replace glucose monitoring or medical advice.

HbA1c to Estimated Average Glucose (eAG)

Convert HbA1c (%) to estimated average glucose (eAG) in mg/dL using the ADA formula.

What this calculator does

This tool converts your HbA1c (glycated hemoglobin) percentage to an estimated average glucose (eAG) value in mg/dL using the American Diabetes Association formula. It gives a rough idea of what your average blood sugar has been over the past 2–3 months.

What your result means

The result is an estimated average glucose in mg/dL. It is for reference only and does not replace blood glucose monitoring or your doctor’s advice. Your care team will interpret it in context with your treatment plan.

This is not medical advice. A healthcare provider should interpret results in your context.

HbA1c (%)

Key terms

HbA1c: Glycated hemoglobin; a measure of average blood glucose over the past 2–3 months, reported as a percentage (NGSP) or mmol/mol (IFCC).
eAG: Estimated average glucose; a calculated value in mg/dL that corresponds to an HbA1c level, using the ADA formula.
ADA formula: eAG (mg/dL) = 28.7 × HbA1c (%) − 46.7; used to express HbA1c as an average glucose value.

Related calculators

HbA1c Unit Converter (NGSP % to IFCC mmol/mol)Diabetes
BMI CalculatorBody & metabolic
BSA Calculator (Mosteller)Body & metabolic
Ideal Body Weight (Devine)Body & metabolic
Adjusted Body WeightBody & metabolic
GFR (CKD-EPI)Renal & lab
GFR (MDRD 4-variable)Renal & lab
Creatinine Clearance (Cockcroft-Gault)Renal & lab

View all calculators

This tool is for educational and reference use only. It does not constitute medical advice. Always consult a healthcare professional for medical decisions.