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Diabetes & metabolism

HbA1c: convert % to mmol/mol

mmol/mol = % × 10.93 − 23.52

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Enter a value in any unit and all other units fill in.

Conversion formulas

% → mmol/molmmol/mol = % × 10.93 − 23.52
mmol/mol → %% = mmol/mol × 0.09148 + 2.152

Conversion table

Highlighted: values inside the adult reference range.

%mmol/mol
1-12.59
2-1.662
39.27
420.2
531.13
642.06
753
863.93
974.86
1085.79
1196.72
12107.7
13118.6
14129.5

Reference range

4 – 5.6 % = 20.2 – 37.69 mmol/mol

Source: NIDDK (NIH): Diagnostic tests for diabetes and prediabetes · Last reviewed: 2026-10-14

Frequently asked questions

How do I convert HbA1c from % to mmol/mol?

mmol/mol = % × 10.93 − 23.52. For example, 5 % equals 31.1 mmol/mol.

How many mmol/mol are 5 %?

5 % equal 31.1 mmol/mol (HbA1c).

How do I convert HbA1c from mmol/mol back to %?

% = mmol/mol × 0.09148 + 2.152.

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