HbA1c ↔ Average Glucose (eAG) Converter

Convert your HbA1c percentage to an estimated average glucose (the number your glucometer shows), and back again.

✓ Reviewed by Dr. Poonam Sekhon Chahal · 3 Aug 2026

How this is calculated

Estimated average glucose is derived from HbA1c using the ADAG study regression: eAG (mg/dL) = 28.7 × HbA1c − 46.7. HbA1c reflects your average blood sugar over roughly the last 2–3 months.

Sources

  1. Nathan DM, Kuenen J, Borg R, et al. Translating the A1C assay into estimated average glucose values. Diabetes Care 2008.
  2. American Diabetes Association Standards of Care in Diabetes — Diagnosis. Diabetes Care 2026.

Related reading

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HbA1c: when should you worry?

Your HbA1c is a 3-month average of your blood sugar. Here are the exact numbers that mean normal, prediabetes, and diabetes — in plain English.

3 minDr. Poonam Sekhon ChahalDr. Poonam Sekhon Chahal
This calculator is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. The result is based on standard clinical formulas applied to the values you entered — your individual situation may need adjustments your doctor can make. Never disregard professional medical advice or delay seeking it because of something you read or calculated on healthcalculus.

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HbA1c: when should you worry?
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