Clinical Calculator
HbA1c to Estimated Blood Glucose Converter
Convert your HbA1c percentage to Estimated Average Glucose (eAG) in mg/dL and mmol/L to understand your blood sugar trends.
What is HbA1c?
HbA1c (glycated hemoglobin) measures the amount of glucose attached to red blood cells. Because red blood cells live for about 3 months, an HbA1c test reflects your average blood glucose levels over the past 90 days.
The ADAG Formula
This converter utilizes the ADAG (A1c-Derived Average Glucose) formula to translate your HbA1c percentage into Estimated Average Glucose (eAG) in mg/dL and mmol/L. The formula is:
eAG (mg/dL) = (28.7 * HbA1c) - 46.7
While daily finger-prick tests measure blood glucose at a single point, eAG provides a broader view of your average blood sugar levels over time.
Diagnostic Tiers
- Normal: HbA1c below 5.7%
- Prediabetes: HbA1c between 5.7% and 6.4%
- Diabetes: HbA1c of 6.5% or higher
Frequently Asked Questions
For individuals with diabetes or prediabetes, testing is typically recommended every 3 to 6 months. Healthy adults should have it screened during routine annual exams.
No, because HbA1c reflects a 3-month average, it does not require fasting and can be tested at any time of day.
No, HbA1c levels change gradually over weeks as old red blood cells are replaced by new ones.