A1C Unit Converter (% and mmol/mol)
Convert HbA1c between percentage and IFCC mmol/mol units.
Your result
The UK and many countries report A1C in mmol/mol. The conversion is NGSP % = 0.09148 × IFCC + 2.152. 48 mmol/mol is the diabetes threshold.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
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Frequently asked questions
What does the A1C Unit Converter (% and mmol/mol) do?
Convert HbA1c between percentage and IFCC mmol/mol units. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: a1c mmol/mol to percent; hba1c units converter; ifcc a1c.