HbA1c Calculator

The calculator enables the conversion of HbA1c values from % (NGSP) to mmol/mol (IFCC) and vice versa. In addition, average blood glucose levels can be converted from mg/dL to mmol/L. By insertion of any value all other fields will update automatically.


Average blood glucose


The International Consensus Statement of US and European Diabetes Associations recommend consistent standardization of the HbA1c determination to the IFCC1 reference measurement procedure, using the new unit mmol/mol. Since these new values in mmol/mol differ from values determined by the standardization according to NGSP2, it is recommended that HbA1c results should be reported in both units, mmol/mol (SI unit) and derived NGSP units (%). 

1International Federation of Clinical Chemistry

2National Glycohemoglobin Standardization Programme