HbA1c to Average Glucose Calculator

Calculator

Glycosylated hemoglobin (HbA1c) reflects average glucose over the prior 2–3 months. Enter HbA1c and press Calculate to estimate average plasma and whole blood glucose.

HbA1c (%)

Tip: press Enter to calculate

Average plasma glucose

mg/dL mmol/L

Average whole blood glucose

mg/dL mmol/L

Clinical note: These are estimates and should be interpreted in clinical context (anemia/hemoglobinopathies, transfusion, pregnancy, CKD, and assay differences can affect HbA1c).

Formulas & references

Formulas

Average plasma glucose (mg/dL) = (HbA1c × 35.6) − 77.3
Average plasma glucose (mmol/L) = (HbA1c × 1.98) − 4.29
Average whole blood glucose = plasma glucose ÷ 1.12

Reference

Rohlfing CL et al. Defining the relationship between plasma glucose and HbA1c: analysis of glucose profiles and HbA1c in the Diabetes Control and Complications Trial. Diabetes Care. 2002;25:275–278. PubMed.

Created 1/7/2006

Disclaimer

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