HbA1c / Average Glucose Converter

Convert glycated hemoglobin to estimated average glucose (ADA 2023)

Convert HbA1c (%) to estimated average glucose (eAG) in mg/dL or mmol/L, and vice versa. Classification based on ADA Standards of Medical Care in Diabetes 2023.

For guidance only. This converter is informational only. Diabetes diagnosis and treatment is performed by a physician.

Conversion type

HbA1c (%)

Typical range: 4.0 – 14.0%

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How it works

1Select the conversion type: HbA1c to glucose, or glucose to HbA1c.
2Enter the value you want to convert.
3Get the converted value in mg/dL and mmol/L.
4Check the ADA 2023 classification and corresponding status.

Frequently asked questions

HbA1c converter: from percentage to average glucose

HbA1c (glycated hemoglobin) is the most important test for diabetes management. It measures the percentage of hemoglobin with attached glucose and reflects the average blood sugar over the past 2-3 months.

Value interpretation

Below 5.7%: normal, no diabetes.
5.7% – 6.4%: prediabetes. Increased risk.
6.5% or above: diabetes. Confirmed with a second test.
Target for people with diabetes: generally <7% (per ADA).
Stricter target in young people without hypoglycemia: <6.5%.

Converting HbA1c to average glucose

ADAG formula (Average Daily Glucose): Average glucose (mg/dL) = 28.7 × HbA1c − 46.7. Example: HbA1c of 7% = 154 mg/dL average glucose. In mmol/L: Glucose = 1.59 × HbA1c − 2.59.

HbA1c limitations

HbA1c does not capture glycemic variability (blood sugar spikes and dips). A person can have normal HbA1c with frequent nocturnal hypoglycemia or postprandial hyperglycemia. That is why continuous glucose monitoring (CGM) complements HbA1c in modern diabetes management.

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