HbA1c to eAG Calculator
Convert HbA1c (%) to Estimated Average Glucose (eAG) in mg/dL and mmol/L using the ADAG equation.
HbA1c Test: Normal Range, Diabetes, NGSP, IFCC & eAG Explained →
HbA1c to Estimated Average Glucose Calculator
HbA1c to eAG Calculation Result
What Is HbA1c?
HbA1c, also known as glycated hemoglobin, is a laboratory test that reflects average blood glucose exposure over the preceding weeks to months. HbA1c is widely used in diabetes diagnosis and monitoring.
HbA1c is reported as a percentage. The HbA1c result can also be related to an estimated average glucose value, known as eAG, which is commonly expressed in mg/dL or mmol/L.
What Is Estimated Average Glucose (eAG)?
Estimated Average Glucose (eAG) is a calculated estimate of average glucose derived from HbA1c. The relationship used by this calculator comes from the A1c-Derived Average Glucose (ADAG) study.
The eAG value helps relate an HbA1c percentage to glucose concentrations that are commonly reported by glucose meters and laboratories.
HbA1c to eAG Formula
eAG (mmol/L) = eAG (mg/dL) ÷ 18
The NGSP reports the ADAG relationship as eAG (mg/dL) = 28.7 × HbA1c − 46.7, with an r² of 0.84.
HbA1c to eAG Conversion Table
| HbA1c (%) | IFCC (mmol/mol) | eAG (mg/dL) | eAG (mmol/L) |
|---|---|---|---|
| 5.0% | 31 | 97 | 5.4 |
| 5.5% | 37 | 111 | 6.2 |
| 6.0% | 42 | 126 | 7.0 |
| 6.5% | 48 | 140 | 7.8 |
| 7.0% | 53 | 154 | 8.6 |
| 7.5% | 58 | 169 | 9.4 |
| 8.0% | 64 | 183 | 10.2 |
| 9.0% | 75 | 212 | 11.8 |
| 10.0% | 86 | 240 | 13.4 |
| 11.0% | 97 | 269 | 14.9 |
| 12.0% | 108 | 298 | 16.5 |
Example: HbA1c 7% to eAG
If HbA1c is 7.0%, the ADAG equation gives:
eAG = 154.2 mg/dL
eAG ≈ 8.6 mmol/L
HbA1c Normal, Prediabetes and Diabetes Range
| HbA1c | General Interpretation |
|---|---|
| Below 5.7% | Below the prediabetes range |
| 5.7–6.4% | Prediabetes range |
| ≥6.5% | Diabetes diagnostic threshold |
HbA1c interpretation should always consider the appropriate diagnostic criteria and clinical context. A result near a diagnostic threshold may require confirmation according to applicable guidelines.
NGSP and IFCC HbA1c
HbA1c can be reported using different standardized systems. The NGSP system commonly reports HbA1c as a percentage, while the IFCC system reports HbA1c in mmol/mol.
For example, HbA1c of 7.0% corresponds to approximately 53 mmol/mol in IFCC units.
How to Use This HbA1c to eAG Calculator
- Enter the HbA1c value as a percentage.
- Click Calculate eAG.
- The calculator applies the ADAG equation.
- The estimated average glucose is displayed in mg/dL.
- The corresponding eAG is also displayed in mmol/L.
Clinical Use of HbA1c and eAG
HbA1c is commonly used to assess longer-term glycemic exposure and to monitor glycemic management in people with diabetes. eAG provides a calculated way to express the HbA1c result as an estimated average glucose concentration.
- Diabetes monitoring
- Assessment of long-term glycemic exposure
- Understanding HbA1c results
- Relating HbA1c to glucose units
- Laboratory and medical education
HbA1c vs eAG
| Feature | HbA1c | eAG |
|---|---|---|
| Reported as | % or mmol/mol | mg/dL or mmol/L |
| Type | Laboratory measurement | Calculated estimate |
| Reflects | Longer-term glycemic exposure | Estimated average glucose |
Limitations of HbA1c to eAG Conversion
- eAG is an estimate derived from HbA1c and is not a direct glucose measurement.
- Individual glucose patterns may differ from the calculated eAG.
- Conditions affecting red blood cell survival can affect HbA1c interpretation.
- Hemoglobin variants may interfere with some HbA1c analytical methods.
- The calculator should not be used as the sole basis for diagnosis or treatment decisions.
Read the complete LabProSuite guide:
HbA1c Test: Normal Range, Diabetes, NGSP, IFCC & eAG Explained →
Frequently Asked Questions
What is HbA1c?
HbA1c is glycated hemoglobin and reflects average blood glucose exposure over the preceding weeks to months.
What is eAG?
eAG means Estimated Average Glucose. It is a calculated estimate of average glucose derived from HbA1c.
What formula is used to calculate eAG?
The ADAG equation is: eAG (mg/dL) = 28.7 × HbA1c − 46.7.
How do I convert eAG from mg/dL to mmol/L?
Divide the eAG value in mg/dL by 18 to obtain the approximate value in mmol/L.
What is the eAG for HbA1c 7%?
Using the ADAG equation, HbA1c of 7.0% corresponds to approximately 154 mg/dL or 8.6 mmol/L.
Is eAG the same as a blood glucose measurement?
No. eAG is a calculated estimate derived from HbA1c and is not a direct measurement of glucose at a particular time.
Can HbA1c be affected by anemia or hemoglobin variants?
Yes. Conditions that alter red blood cell turnover and some hemoglobin variants can affect HbA1c interpretation depending on the analytical method.
Related LabProSuite Resource
Learn about HbA1c normal range, diabetes and prediabetes levels, NGSP, IFCC, HbA1c testing methods, eAG and factors affecting HbA1c results.
Disclaimer
This calculator is provided for educational and laboratory reference purposes only. It does not replace professional medical evaluation, diagnosis, treatment, laboratory procedures, or clinical judgment.
HbA1c results should be interpreted together with clinical history, other laboratory findings, and applicable clinical guidelines.
References
- National Glycohemoglobin Standardization Program (NGSP): HbA1c and Estimated Average Glucose.
- Nathan DM, Kuenen J, Borg R, Zheng H, Schoenfeld D, Heine RJ. A1c-Derived Average Glucose (ADAG) Study.
- International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) HbA1c standardization.
