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HbA1c ↔ Average Glucose Converter

Convert an HbA1c result to estimated average glucose (eAG) in mg/dL and mmol/L — or the other way round.

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About the conversion

HbA1c reflects your average blood sugar over the past 2–3 months. This converter uses the formula from the ADAG study: eAG (mg/dL) = 28.7 × HbA1c (%) − 46.7. It also converts between % (NGSP) and mmol/mol (IFCC) units.

What the numbers mean

  • Below 5.7% (39 mmol/mol): normal
  • 5.7–6.4% (39–47 mmol/mol): prediabetes
  • 6.5% (48 mmol/mol) or higher: diabetes range

Many adults with diabetes aim for below 7% (53 mmol/mol), but your target should be set with your care team.

Medically reviewed by Daniel Reyes, MS, RDUpdated on

Sources

  1. Nathan DM, et al. (2008). Translating the A1C assay into estimated average glucose values. Diabetes Care. https://doi.org/10.2337/dc08-0545