A1C to Blood Sugar Calculator
Translate your 3-month hemoglobin A1C percentage into estimated average glucose (eAG) in mg/dL and mmol/L using the scientifically validated ADAG clinical trial formula.
A1C to Glucose Calculator
Free, clinical-grade reference tools that explain blood pressure, blood sugar, and A1C numbers in plain, friendly words for adults and seniors.
Normal is below 5.7%
Standard
International standard
An A1C of 6.5% or greater on two separate tests confirms diabetes.
Recommended Action: Work closely with your medical team to establish an individualized A1C goal (often around 7.0% for most adults), adjust nutrition, and evaluate medication if necessary.
Official ADAG Clinical Formula:
eAG (mg/dL) = 28.7 × A1C − 46.7(Nathan DM et al., A1C-Derived Average Glucose Study, Diabetes Care 2008)What is Hemoglobin A1C and Estimated Average Glucose (eAG)?
Hemoglobin A1C measures the percentage of your red blood cells coated with glucose over their 2-to-3-month lifespan. The ADAG clinical study (Diabetes Care 2008) established the mathematical relationship translating this percentage into everyday blood sugar units.
How to Use This Converter
Enter your lab A1C result to see what daily blood sugar reading it reflects, or enter your average home glucose reading to estimate your upcoming A1C test result.