A1C / eAG Converter
HbA1c to Average Glucose
Convert A1C percentage to estimated average glucose with diabetic and prediabetic ranges.
Understanding A1C
A1C is the most common marker clinicians use to diagnose and track diabetes. It measures the percentage of hemoglobin molecules that have glucose permanently attached — essentially, how much your red blood cells have been "candied" by circulating sugar over the last 2-3 months.
The Conversion Formula
This linear relationship comes from the 2008 ADAG (A1C-Derived Average Glucose) study — 507 participants with continuous glucose monitoring over 12 weeks, correlated against A1C. It's now the standard conversion recognized by the ADA and IDF.
What Moves A1C
Diet: reducing refined carbs and added sugars has the largest short-term effect. Exercise: post-meal walks blunt glucose spikes; regular aerobic training improves insulin sensitivity. Weight loss: even 5-7% bodyweight loss can drop A1C by 0.5-1.0 points in people with prediabetes. Sleep: poor sleep raises morning glucose and insulin resistance within days. Medication adherence when prescribed.
Formula
Diagnostic Ranges (ADA)
Tips & Limitations
Medical Disclaimer
This converter is educational. A single lab value is not a diagnosis, and A1C can be skewed by anemia, hemoglobin variants, and kidney disease. Use results to understand your labs and discuss them with your clinician.