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Learn more โA1C to Average Glucose Calculator (eAG)
This calculator turns an HbA1c (%) value into estimated average glucose (eAG), showing both mg/dL and mmol/L. It uses the standard formula to help you understand what your A1C number means in everyday blood sugar terms for diabetes management.
Enter your HbA1c percentage to see your estimated average glucose.
How it works
What is estimated average glucose (eAG)?
HbA1c reflects your average blood sugar over the past two to three months. Estimated average glucose (eAG) translates that percentage into the same units you see on a daily glucose meter.
The conversion uses the formula mg/dL = 28.7 ร A1C โ 46.7, and mmol/L = mg/dL รท 18, so you can compare your lab result to everyday readings.
Why eAG is useful
Seeing your A1C as an average glucose number makes the result easier to relate to. A higher A1C means a higher average glucose and generally a higher risk of diabetes complications.
Use eAG as a reference point alongside your meter readings, not as a replacement for them or for professional guidance.
Frequently asked questions
โบHow is A1C converted to average glucose?
The calculator uses mg/dL = 28.7 ร A1C โ 46.7, then divides mg/dL by 18 to get mmol/L.
โบIs this result a diagnosis or medical advice?
No. This is only an estimate and not medical advice. Always consult a qualified clinician about your results and treatment.
โบWhy does eAG differ from my meter readings?
eAG is an average over months, while meter readings show single moments. Day-to-day values naturally rise and fall around the average.
โบWhat A1C is considered normal?
An A1C below 5.7% is generally considered normal, but targets vary by person. Ask your clinician what range is right for you.
โบCan I enter A1C in mmol/mol?
This tool expects A1C as a percentage. If your lab reports mmol/mol, convert it to a percentage first or ask your clinician.
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