A1C to Blood Sugar Converter

Hemoglobin A1C (HbA1c) is a blood test that measures the percentage of hemoglobin coated with glucose over the past two to three months. It provides a longer-term picture of blood sugar control than a single fasting glucose reading. The American Diabetes Association uses an A1C of 6.5% or higher for a diabetes diagnosis, 5.7% to 6.4% for prediabetes, and below 5.7% as normal. Have your A1C interpreted by your physician in the context of your full health picture.

This calculator uses the ADAG (A1C-Derived Average Glucose) formula published by the ADA and developed from a large international study: eAG (mg/dL) = 28.7 x A1C - 46.7. This gives the estimated average glucose that corresponds to your A1C, expressed in the same units as a home blood glucose monitor. The conversion is an estimate, as individual glycation patterns vary. Your physician can provide clinical interpretation.

A1C results are one tool your diabetes care team uses to guide treatment decisions. Do not adjust diabetes medications or insulin doses based on A1C alone without consulting your physician or certified diabetes educator. Day-to-day blood glucose monitoring provides more actionable data for meal and medication timing. Your A1C target may also differ from general population targets if you are pregnant, elderly, or have specific comorbidities.

Yes. Conditions that affect red blood cell turnover, including hemolytic anemia, sickle cell trait or disease, iron deficiency anemia, and certain hemoglobin variants, can cause artificially low or high A1C readings. Pregnancy, recent blood transfusions, and kidney disease can also affect results. In these cases, your physician may rely on fasting glucose or continuous glucose monitoring data instead. Always disclose any blood disorders to your healthcare provider.