HbA1c Conversion Calculator
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HbA1c is reported as a percent in the U.S. and in mmol/mol in many other countries. 7% equals 53 mmol/mol and an estimated average glucose of 154 mg/dL (8.6 mmol/L).
| NGSP / DCCT | 7% |
| IFCC | 53 mmol/mol |
| Estimated average glucose | 154 mg/dL · 8.56 mmol/L |
| Diagnostic category (ADA) | diabetes range (6.5% or higher) |
Show steps
- IFCC (mmol/mol) = 10.929 × (NGSP% − 2.15).
- eAG (mg/dL) = 28.7 × A1C − 46.7 (ADAG study); divide by 18.016 for mmol/L.
Conversion formulas
- IFCC (mmol/mol) = 10.929 × (NGSP % − 2.15).
- NGSP % = IFCC ÷ 10.929 + 2.15.
- Estimated average glucose (mg/dL) = 28.7 × A1C − 46.7; divide by 18.016 for mmol/L.
Conversion table
| HbA1c % | mmol/mol | eAG mg/dL |
|---|---|---|
| 5.0 | 31 | 97 |
| 5.7 | 39 | 117 |
| 6.5 | 48 | 140 |
| 7.0 | 53 | 154 |
| 8.0 | 64 | 183 |
| 9.0 | 75 | 212 |
| 10.0 | 86 | 240 |
ADA ranges
Below 5.7% is normal, 5.7% to 6.4% is the prediabetes range and 6.5% or higher on repeat testing indicates diabetes. Many adults with diabetes aim for below 7%, but targets are individual.
HbA1c Conversion Calculator quiz: 10 questions
Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.
Quiz complete
Frequently asked questions
How do I convert HbA1c % to mmol/mol?
Subtract 2.15 and multiply by 10.929.
What is estimated average glucose?
The average blood glucose that corresponds to an HbA1c, from the ADAG study.
What HbA1c is normal?
Below 5.7%, or below 39 mmol/mol.
Is this the same as the A1C calculator?
This page focuses on unit conversion in both directions; the A1C calculator also estimates A1C from glucose readings.
Does it replace a lab test?
No.
Sources
- Nathan et al. (2008), Translating the A1C assay into estimated average glucose values, Diabetes Care
- American Diabetes Association: Standards of Care, Diagnosis
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