The converter enables the conversion of HbA1c values from % (National Glycohemoglobin Standardization Programme - NGSP) to mmol/mol (International Federation of Clinical Chemistry - IFCC) and vice versa. In addition, estimated average glucose (eAG) levels are shown and can be converted to HbA1c from both mg/dL and mmol/L. No fuss calculator. Does what it says on the tin.