HbA1c Calculator

Convert between HbA1c and estimated average glucose

HbA1c (%)

Estimated Average Glucose (eAG)

mg/dL

What is HbA1c?

HbA1c (glycated hemoglobin) measures the percentage of hemoglobin in your blood that has glucose attached to it. It reflects your average blood sugar level over the past 2–3 months and is a key test for diagnosing and monitoring diabetes.

The ADAG Formula

This calculator uses the formula from the A1C-Derived Average Glucose (ADAG) study: eAG (mg/dL) = 28.7 × HbA1c − 46.7. This internationally recognized formula was established through a large multicenter study published in 2008.

eAG = 28.7 × HbA1c − 46.7 mg/dL

Understanding Your Results

Normal

Below 5.7%

Your blood sugar levels are within a healthy range. Maintain a balanced diet and regular exercise.

Prediabetes

5.7% – 6.4%

Your blood sugar is higher than normal. Lifestyle changes can help prevent progression to type 2 diabetes.

Diabetes

6.5% or higher

This level indicates diabetes. Work with your healthcare provider to develop a management plan.