HbA1c: % (DCCT) to mmol/mol (IFCC)
Convert HbA1c between % (DCCT) and mmol/mol (IFCC) — HbA1c is reported as a percentage (NGSP/DCCT) in the US and in mmol/mol (IFCC) in much of the world. Estimated average glucose (eAG) in mg/dL ≈ 28.7 × A1c% − 46.7. Type in either box to convert both ways.
7 % (DCCT) of HbA1c = 53 mmol/mol (IFCC)
ADA cut-offs; a diagnosis needs repeat testing. General adult guide — the reference range printed on your own lab report is the one that applies to you.
HbA1c conversion table (% (DCCT) to mmol/mol (IFCC))
| HbA1c (% (DCCT)) | HbA1c (mmol/mol (IFCC)) |
|---|---|
| 5 % (DCCT) | 31.1 mmol/mol (IFCC) |
| 5.7 % (DCCT) | 38.8 mmol/mol (IFCC) |
| 6 % (DCCT) | 42.1 mmol/mol (IFCC) |
| 6.5 % (DCCT) | 47.5 mmol/mol (IFCC) |
| 7 % (DCCT) | 53 mmol/mol (IFCC) |
| 8 % (DCCT) | 63.9 mmol/mol (IFCC) |
| 9 % (DCCT) | 74.9 mmol/mol (IFCC) |
| 10 % (DCCT) | 85.8 mmol/mol (IFCC) |
How to convert HbA1c from % (DCCT) to mmol/mol (IFCC)
To convert HbA1c, IFCC mmol/mol = (DCCT % − 2.15) × 10.929. For example, 7 % (DCCT) equals 53 mmol/mol (IFCC). The converter above runs the exact formula at full precision and updates as you type; the swap button flips the direction.
Frequently asked questions
How do you convert HbA1c from % (DCCT) to mmol/mol (IFCC)?
IFCC mmol/mol = (DCCT % − 2.15) × 10.929. For example, 7 % (DCCT) is 53 mmol/mol (IFCC). The converter above does this instantly and works both ways — type a value in either box. It uses the exact formula at full precision, so the result matches published clinical conversions.
What is a normal HbA1c level?
Below 5.7% (39 mmol/mol) is normal; 5.7–6.4% (39–46 mmol/mol) is prediabetes; 6.5% (48 mmol/mol) or above indicates diabetes. These are general adult figures only — the reference interval on your own lab report is what applies to you, and it can differ by lab, method, age and sex. The conversion table above runs from 5 to 10 % (DCCT), or 31.1 to 85.8 mmol/mol (IFCC), so a range quoted in either system can be lined up against your own figure.
Why is HbA1c reported in different units?
HbA1c is reported as a percentage (NGSP/DCCT) in the US and in mmol/mol (IFCC) in much of the world. Estimated average glucose (eAG) in mg/dL ≈ 28.7 × A1c% − 46.7. The two systems describe the same measurement, so a value converts exactly from one to the other with no loss of meaning — only the units and the number change. That is why guidelines, journals and lab reports from different countries quote different numbers for the same HbA1c result. The two boxes above are labelled % (DCCT) and mmol/mol (IFCC), so you can read a value in whichever system your own report uses.
Is this HbA1c converter accurate and free?
Yes — this HbA1c converter is both accurate and free. It applies the standard, published conversion formula at full double precision in your browser, with nothing uploaded or stored, and there is no sign-up or usage limit. It converts units only and does not interpret or diagnose results.
This is a unit-conversion reference tool, not a diagnosis or medical advice. Reference intervals are general adult guides that vary by laboratory, method and individual — always read your result against the range printed on your own report and discuss it with a qualified healthcare professional.
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