Free Clinical Tool

HbA1c to eAG Calculator

Instantly convert your HbA1c test results into Estimated Average Glucose (eAG) and IFCC units.

Enter your HbA1c Value
%
Standard clinical lab result (Normal: < 5.7% or < 39 mmol/mol)
Quick Examples:
Your Glycemic Assessment
Normal (Non-Diabetic Range)
Estimated Avg Glucose (eAG)
-- mg/dL
Estimated Avg Glucose (mmol/L)
-- mmol/L
<5.7% Normal 5.7–6.4% Prediabetes 6.5–6.9% Diabetes 7.0–7.9% Target ≥8.0% Elevated
IFCC Equivalent Value: --
HbA1c to eAG Calculator Online

HbA1c to Estimated Average Glucose (eAG) Reference Chart

The table below details the direct mathematical relationship established by the international ADAG (A1c-Derived Average Glucose) clinical study.

HbA1c (%) IFCC (mmol/mol) eAG (mg/dL) eAG (mmol/L) Clinical Category
5.0 % 31 mmol/mol 97 mg/dL 5.4 mmol/L Normal (Non-Diabetic Range)
5.5 % 37 mmol/mol 111 mg/dL 6.2 mmol/L Normal (Non-Diabetic Range)
5.7 % 39 mmol/mol 117 mg/dL 6.5 mmol/L Prediabetes (Increased Risk)
6.0 % 42 mmol/mol 126 mg/dL 7.0 mmol/L Prediabetes (Increased Risk)
6.5 % 48 mmol/mol 140 mg/dL 7.8 mmol/L Diabetes Diagnostic Threshold
7.0 % 53 mmol/mol 154 mg/dL 8.6 mmol/L Diabetic Target / Moderate Control
7.5 % 58 mmol/mol 169 mg/dL 9.4 mmol/L Diabetic Target / Moderate Control
8.0 % 64 mmol/mol 183 mg/dL 10.1 mmol/L Elevated (High Risk of Complications)
9.0 % 75 mmol/mol 212 mg/dL 11.8 mmol/L Elevated (High Risk of Complications)

How is eAG Calculated from HbA1c?

The standard ADAG clinical equation defined by the American Diabetes Association (ADA) is:

eAG (mg/dL) = 28.7 × HbA1c (%) − 46.7

To obtain the average glucose in international units (mmol/L):

eAG (mmol/L) = (28.7 × HbA1c (%) − 46.7) ÷ 18.0182

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Frequently Asked Questions (FAQ)

What is the difference between HbA1c and daily blood sugar?
A daily fingerstick or CGM reading shows your glucose at that exact second. HbA1c (glycated hemoglobin) reflects your weighted 2-to-3 month average blood sugar because red blood cells live approximately 120 days.
What is Estimated Average Glucose (eAG)?
eAG translates your 3-month HbA1c percentage into the familiar daily mg/dL or mmol/L numbers you see on your personal glucose meter.
How often should HbA1c be tested?
Patients with well-controlled stable diabetes typically test every 6 months. When starting new medications or when glycemic targets are not met, testing every 3 months is standard.
How do you convert HbA1c % to IFCC mmol/mol?
The IFCC master formula is: IFCC (mmol/mol) = (HbA1c % - 2.15) × 10.929. For example, 7.0% equals 53 mmol/mol.

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Medical Disclaimer: This calculator is intended strictly for educational and informational purposes and does not replace medical advice, diagnosis, or treatment. Always consult your physician.