Blood Glucose to A1C Converter

HbA1c (glycated hemoglobin) is a blood test that measures your average blood sugar levels over the past 2 to 3 months. It reflects the percentage of hemoglobin proteins in your blood that are coated with sugar. It is a key metric for diagnosing and managing diabetes because it provides a longer-term picture than a single glucose reading.

A1C and average blood glucose are related through the DCCT formula: A1C = (Average Glucose in mg/dL + 46.7) / 28.7. For example, an A1C of 7% corresponds to an average blood glucose of approximately 154 mg/dL (8.6 mmol/L). Higher A1C values indicate higher average glucose levels over the past 2-3 months.

For most adults with diabetes, the American Diabetes Association recommends a target A1C below 7%. Normal A1C is below 5.7%, prediabetes ranges from 5.7% to 6.4%, and diabetes is diagnosed at 6.5% or higher. Your doctor may set a different target based on your age, health conditions, and risk of hypoglycemia.

The ADA recommends A1C testing at least twice a year for people meeting treatment goals, and quarterly for those whose therapy has changed or who are not meeting glycemic goals. Your healthcare provider may recommend more frequent testing if your blood sugar levels are not well controlled.

Several conditions can affect A1C results, including anemia, hemoglobin variants (such as sickle cell trait), kidney disease, liver disease, recent blood transfusions, and certain medications. Pregnancy can also affect A1C readings. If you have any of these conditions, discuss alternative monitoring methods with your healthcare provider.