A1C 6.5% to Estimated Average Glucose
An A1C of 6.5% equals an estimated average glucose of approximately 140 mg/dL, the clinical diabetes diagnosis threshold.
How to use this tool
- Enter hba1c in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your avg glucose (mg/dl) and the full breakdown beneath it.
A1C of 6.5% is the diagnostic cutoff for diabetes, corresponding to an estimated average glucose of about 140 mg/dL.
Frequently asked questions
- What is eAG?
- Estimated average glucose (eAG) translates the HbA1c percentage into mg/dL or mmol/L units familiar from a home glucose meter. It was introduced by the ADA to make A1C results more intuitive.
- Is eAG the same as fasting glucose?
- No. eAG reflects a weighted average over ~3 months including post-meal peaks, not just fasting values. It will typically be higher than a fasting glucose reading.
- What A1C targets do guidelines recommend?
- Most diabetes guidelines recommend A1C below 7% (eAG <154 mg/dL) for most adults with diabetes, though targets are individualised. Speak with your endocrinologist.