Convert HbA1c between mmol/mol (used in the UK) and % (used in the US), see your estimated average glucose, and convert blood sugar readings between mmol/L and mg/dL.
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The formulas
- HbA1c mmol/mol = (HbA1c % − 2.15) × 10.929
- Estimated average glucose (mg/dL) = 28.7 × HbA1c % − 46.7
- Blood sugar mg/dL = mmol/L × 18
HbA1c conversion table
| HbA1c % | mmol/mol | Average glucose (mmol/L) |
|---|---|---|
| 5.5 | 37 | 6.2 |
| 6.0 | 42 | 7.0 |
| 6.5 | 48 | 7.8 |
| 7.0 | 53 | 8.6 |
| 7.5 | 58 | 9.4 |
| 8.0 | 64 | 10.2 |
| 9.0 | 75 | 11.7 |
| 10.0 | 86 | 13.3 |
What HbA1c results mean
| Result | mmol/mol | % |
|---|---|---|
| Normal | Below 42 | Below 6.0 |
| Prediabetes (UK) | 42 to 47 | 6.0 to 6.4 |
| Diabetes | 48 or more | 6.5 or more |
In the US, the American Diabetes Association uses 5.7% to 6.4% for prediabetes. For people with diabetes, a common target is 48 mmol/mol (6.5%) or below, but your diabetes team may set a different target for you.
This converter is for information only and can’t diagnose diabetes. Always discuss results with your GP or diabetes team.
Frequently asked questions
How do I convert HbA1c % to mmol/mol?
Subtract 2.15, then multiply by 10.929. For example, 7% is (7 − 2.15) × 10.929 = 53 mmol/mol.
What is a normal HbA1c?
Below 42 mmol/mol (6.0%) in the UK.
How do I convert mmol/L to mg/dL?
Multiply by 18. So 7 mmol/L is about 126 mg/dL.
What does HbA1c measure?
Your average blood sugar over roughly the last 2 to 3 months.
Sources
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