Blood Sugar Average Calculator
Turn an HbA1c reading into the average blood glucose it represents, in both mg/dL and mmol/L.
Recent
Formula
How the calculation works
The formula turns an HbA1c percentage into an estimated average glucose in mg/dL.
Dividing by 18.0182 gives the same figure in mmol/L, the unit used in many countries.
So an A1c of seven per cent is about 154 mg/dL, or roughly 8.6 mmol/L.
Common mistakes
- Reading the estimate as a single day's reading; it is a three-month average.
- Forgetting that the formula is an estimate and individual meters vary.
When to use it
- Use it to see what an A1c result means as an average glucose.
- It is not a diagnosis; discuss any result with your doctor.
Worked example
An HbA1c of 7 percent equals an average glucose of 154.2 mg/dL, which is about 8.558 mmol/L.
Common questions
What does HbA1c show?
HbA1c reflects the average blood glucose over roughly the past two to three months, not a single day's reading.
Why give two units?
mg/dL is used in the United States and Bangladesh, while mmol/L is used in the United Kingdom and India, so both are shown.
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