Glucose to HbA1c
Average glucose (mmol/L)
HbA1c (mmol/mol)

Important Disclaimer:

This calculator is designed to convert a known long-term average blood glucose obtained from finger prick readings to an estimated HbA1c, or vice-versa. It should not be used with readings from continuous glucose monitors (CGMs) like the FreeStyle Libre. Please use their software instead.

CGM apps calculate a Glucose Management Indicator (GMI) or an estimated A1c based on the average of thousands of readings over many days.

Calculator written by Dr Jeremy Steinberg, GP, Auckland, contact for suggestions