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Calculator: Conversion of hemoglobin A1C from percent to mmol/mol and estimation of corresponding average glucose (conventional and SI units)
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Notes
- Click any of the 4 input boxes to enter a value. The other 3 values will be calculated from your input.
- A1C: hemoglobin A1C; DCCT: Diabetes Control and Complications Trial; IFCC: International Federation of Clinical Chemistry.
- Equations used when A1C (%) is entered:
- A1C (mmol/mol) = 10.929 * (A1C (%) - 2.15)
- Estimated average glucose (mg/dL) = (28.7 * A1C (%)) - 46.7
- Estimated average glucose (mmol/L) = Estimated average glucose (mg/dL) / 18.015
- Equations used when A1C (mmol/mol) is entered:
- A1C (%) = (A1C (mmol/mol) / 10.929) + 2.15
- Estimated average glucose (mg/dL) = (28.7 * A1C (%)) - 46.7
- Estimated average glucose (mmol/L) = Estimated average glucose (mg/dL) / 18.015
- Equations used when Estimated average glucose (mg/dL) is entered:
- A1C (%) = (Estimated average glucose (mg/dL) + 46.7) / 28.7
- A1C (mmol/mol) = 10.929 * (A1C (%) - 2.15)
- Estimated average glucose (mmol/L) = Estimated average glucose (mg/dL) / 18.015
- Equations used when Estimated average glucose (mmol/L) is entered:
- Estimated average glucose (mg/dL) = Estimated average glucose (mmol/L) * 18.015
- A1C (%) = (Estimated average glucose (mg/dL) + 46.7) / 28.7
- A1C (mmol/mol) = 10.929 * (A1C (%) - 2.15)
References
- Nathan DM, Kuenen J, Borg R, et al. A1c-Derived Average Glucose Study Group. Translating the A1C assay into estimated average glucose values. A1c-Derived Average Glucose Study Group. Diabetes Care 2008; 31:1473. Erratum in: Diabetes Care 2009; 32:207.
- Trevino G. Consensus statement on the Worldwide Standardization of the Hemoglobin A1C Measurement: the American Diabetes Association, European Association for the Study of Diabetes, International Federation of Clinical Chemistry and Laboratory Medicine, and the International Diabetes Federation: response to the Consensus Committee. Diabetes Care 2007; 30:e141.
- Hoelzel W, Weykamp C, Jeppsson JO, et al. IFCC Working Group on HbA1c Standardization. IFCC reference system for measurement of hemoglobin A1c in human blood and the national standardization schemes in the United States, Japan, and Sweden: a method-comparison study. Clin Chem 2004; 50:166.
- Little RR, Sacks DB. HbA1c: how do we measure it and what does it mean? Curr Opin Endocrinol Diabetes Obes 2009; 16:113.
Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.
Information on this page may not appear correctly if printed.
All information contained in and produced by the EBMcalc system is provided
for educational purposes only. This information should not be used for the diagnosis or treatment
of any health problem or disease.
THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER.
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Topic 15628 Version 10.0
