HbA1c to Average Blood Sugar Calculator
HbA1c reflects your average blood sugar over the past 2–3 months. This calculator turns it into an estimated average glucose (eAG) in mg/dL and mmol/L, using the formula from the ADAG study.
For information only. A calculator cannot diagnose you; discuss your results with your doctor.
Good to know
This is an estimate: two people with the same HbA1c can have different average sugars. HbA1c can be misleading with anaemia, thalassaemia trait, kidney failure, pregnancy or a recent transfusion. For diagnosis, use the HbA1c ranges on the HbA1c page and your doctor's advice.
Formula
eAG (mg/dL) = 28.7 × HbA1c − 46.7
eAG (mmol/L) = 1.59 × HbA1c − 2.59
Common questions
What average sugar does an HbA1c of 7% mean?
About 154 mg/dL (8.5 mmol/L).
What average sugar does an HbA1c of 8% mean?
About 183 mg/dL (10.1 mmol/L).
Is this calculation exact?
No. It is an estimate: two people with the same HbA1c can have different average sugars.