A1C to Blood Sugar Converter

A1C is expressed as a percentage of hemoglobin that is glycated. eAG (estimated average glucose) expresses the same information in the familiar units of a glucose meter: mg/dL or mmol/L. The ADAG formula converts between them so patients can relate their lab A1C to the numbers they see on their meter.

The United States uses mg/dL for blood glucose. Most other countries, including Canada, the UK, and Latin America, use mmol/L. The conversion is: mg/dL ÷ 18.0182 = mmol/L. The calculator shows both so the result is useful regardless of which system you are familiar with.

The ADA recommends below 7% for most non-pregnant adults with diabetes, which corresponds to an eAG of about 154 mg/dL. For older adults with limited life expectancy or high hypoglycemia risk, less strict targets (below 8% or even 8.5%) may be appropriate. For younger patients with type 1 diabetes and no hypoglycemia risk, a target below 6.5% is sometimes reasonable. Always discuss your personal target with your care team.

An average of your CGM or meter readings over 90 days is a reasonable approximation of eAG. However, it only reflects readings taken, not the full 24-hour glucose curve unless a CGM is worn continuously. A laboratory A1C remains the clinical standard for long-term glucose management decisions. This calculator is for informational purposes only and does not constitute medical advice.