eAG from HbA1c Calculator

Convert HbA1c (%) to estimated average glucose (eAG) in mg/dL and mmol/L.

For educational and clinical reference. Not a substitute for medical judgment. See the medical disclaimer.
eAG (mg/dL)
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eAG (mmol/L)
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References

  1. Nathan DM, Kuenen J, Borg R, et al. Translating the A1C assay into estimated average glucose values. Diabetes Care. 2008;31(8):1473-1478.
  2. American Diabetes Association. Standards of Medical Care in Diabetes — 2024. Diabetes Care. 2024;47(Suppl 1).

How to use

  1. Enter HbA1c as a percentage (e.g., 7.0).
  2. eAG appears instantly in mg/dL and mmol/L.
  3. Use the copy button to copy any value.

Frequently asked questions

How is eAG calculated?

eAG (mg/dL) = 28.7 × HbA1c (%) − 46.7. The formula comes from the ADAG study (Nathan 2008), correlating HbA1c with continuous glucose monitoring averages.

What is the clinical relevance of eAG?

It translates HbA1c (a 2–3 month average) into a glucose value that patients can relate to their fingerstick readings.

What HbA1c target should patients aim for?

ADA generally recommends HbA1c < 7% for most non-pregnant adults with diabetes, with individualization for age, comorbidities, and hypoglycemia risk.

How is mmol/L calculated?

mmol/L = mg/dL ÷ 18.018.

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