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About this tool
Convert HbA1c between DCCT percent, IFCC mmol/mol and estimated average glucose in mg/dL and mmol/L using the ADAG equation.
The HbA1c to Average Glucose Converter translates a glycated haemoglobin result between the four formats laboratories use: DCCT/NGSP percent, IFCC mmol/mol, and estimated average glucose in mg/dL or mmol/L. It applies the ADAG regression published by Nathan and colleagues in Diabetes Care (2008), eAG = 28.7 × A1C − 46.7 mg/dL, together with the NGSP master equation IFCC = (DCCT − 2.15) × 10.929. An HbA1c of 7.0% therefore equals 53 mmol/mol and an average glucose of about 154 mg/dL or 8.6 mmol/L.
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Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Enter any one of the four formats and the other three are derived from the same equations.
Uses the ADAG regression and the NGSP master equation rather than a rounded lookup table.
Flags results outside the roughly 4% to 12% span the ADAG study covered, where eAG is an extrapolation.
About 154 mg/dL, or 8.6 mmol/L, using the ADAG equation eAG = 28.7 × A1C − 46.7. That is an average across roughly the previous three months, so individual meter readings will sit both above and below it through the day.
Subtract 2.15 from the percentage and multiply by 10.929. So 6.5% becomes (6.5 − 2.15) × 10.929 = 48 mmol/mol, and 7.0% becomes 53 mmol/mol. Divide by 10.929 and add 2.15 to convert back.
6.5% (48 mmol/mol) or above on a properly validated assay meets the ADA diagnostic threshold, normally confirmed with a repeat test. 5.7% to 6.4% (39 to 47 mmol/mol) is the prediabetes range, and below 5.7% is normal. Diagnosis is your clinician's to make, not a calculator's.
Estimated average glucose is a population regression, and the ADAG study found a real spread around it — two people with the same HbA1c can have genuinely different average glucose. Meter averages are also biased by when you happen to test, and conditions affecting red cell lifespan such as anaemia, haemoglobin variants, recent transfusion, pregnancy or chronic kidney disease shift HbA1c independently of glucose.
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