GPAtlas🧮 Clinical calculator · Diabetes, lipids and hormones
HbA1c to estimated average glucose
Converts an HbA1c to an average glucose. UK IFCC mmol/mol to mmol/L, so a result can be discussed against the numbers a person sees on their own meter.
Free to use, no account needed. Result: Estimated average glucose. Last reviewed 29 Jul 2026.
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Before you rely on the result: Estimated average glucose explains an HbA1c, it is not a measured glucose, and the conversion is internationally published, not NICE. HbA1c is unreliable where red cell turnover is disturbed or an abnormal haemoglobin is present, and invalid in pregnancy.
Related Ocean Article: Type 2 Diabetes & Insulin therapy (T2DM).
Further reading: Type 1 Diabetes & Insulin therapy (T1DM) · Prediabetes.
Part of the GPAtlas clinical calculators, each result explained, built by practising UK GPs.