A1C calculator
Convert HbA1c (%) to estimated average glucose (mg/dL and mmol/L).
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HbA1c and average glucose, both ways
Enter your HbA1c (%), your average glucose in mg/dL or in mmol/L: the three fields are linked and recompute automatically. A conversion table completes the result.
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Enter a value
A1C, mg/dL or mmol/L.
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Instant read
The other two compute.
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Check the table
Common correspondences.
Good to know
- HbA1c reflects blood sugar over ~2–3 months
- eAG = 28.7 × A1C − 46.7 (mg/dL)
- mmol/L = mg/dL ÷ 18.0182
- Statistical estimate, varies by individual
Example: HbA1c 7%
| Measure | Value |
|---|---|
| HbA1c | 7% |
| Average glucose | ≈ 154 mg/dL |
| In mmol/L | ≈ 8.6 mmol/L |
| Formula | eAG = 28.7 × A1C − 46.7 |
For information only, not medical advice. 100% local calculation, no health data sent.
Frequently asked questions
What formula is used?
The ADAG formula: eAG (mg/dL) = 28.7 × A1C(%) − 46.7. For mmol/L, divide mg/dL by 18.0182. In reverse, A1C = (eAG + 46.7) ÷ 28.7.
What is eAG?
Estimated Average Glucose translates HbA1c — which reflects blood sugar over ~2–3 months — into a familiar glucose value (mg/dL or mmol/L).
Is it accurate for me?
It is an average statistical estimate. The real relationship varies between individuals. It does not replace a lab test or a doctor’s advice.
Is my data private?
Yes. Everything is computed in your browser; no health data is sent. For information only.