Convert between A1C % and estimated average glucose (eAG)
Convert
0
—
—
Reference ranges
Track your weight and nutrition alongside this in the Calorie Tracker, or check your BMI.
This is an educational estimate, not a diagnosis. A1C and average glucose can be affected by conditions like anemia. Always interpret your results with a doctor.
How it works
Enter either number — your A1C percentage, or your average glucose meter reading.
We apply the standard formula (eAG = 28.7 × A1C − 46.7), adopted by the ADA to help translate lab A1C results into the same units as a home glucose meter.
We show where it falls against normal, prediabetes, and diabetes reference ranges.
A1C reflects a 2-3 month average, while a glucose meter shows a single moment in time — they answer different questions and both matter.
Frequently asked questions
A blood test that reflects your average blood sugar level over the past 2-3 months, based on how much glucose has attached to your red blood cells. It's expressed as a percentage.
The standard formula, from a study by Nathan et al. adopted by the ADA: eAG (mg/dL) = 28.7 × A1C − 46.7.
According to the ADA: below 5.7% is normal, 5.7-6.4% is prediabetes, and 6.5% or above indicates diabetes. Your doctor interprets your specific result in context.
No. A glucose meter shows your blood sugar at that exact moment. A1C reflects your average over 2-3 months, smoothing out those swings.