Blood Glucose Average Calculator
Average several blood glucose readings and estimate the corresponding HbA1c percentage used to judge longer-term control.
Recent
Formula
How the calculation works
Enter four blood glucose readings in mg/dL, ideally taken at similar times across different days.
The tool adds the readings and divides by four to get the average glucose level.
It applies the standard conversion of adding 46.7 and dividing by 28.7 to estimate the HbA1c percentage.
Common mistakes
- Mixing units and entering mmol/L readings as if they were mg/dL, because the formula expects the mg/dL scale where normal fasting is about 100.
- Relying on a few readings taken at the same hour, since readings from one time of day alone do not reflect the whole day.
When to use it
- Use it to see how your daily readings translate into an HbA1c figure between lab tests.
- Use it to check whether a run of high readings is pulling your average above the target range.
Worked example
Readings of 110, 130, 120 and 140 mg/dL average 125 mg/dL. The estimated HbA1c is (125 + 46.7) / 28.7, which is about 5.98 percent.
Common questions
How accurate is the estimated HbA1c from readings?
It is only an estimate, and it is most useful when the readings are spread across different times of day, since a lab test is the confirmed measure.
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