HbA1c Calculator
Estimate your HbA1c percentage from your average blood glucose over the last two to three months and see which band it falls into.
Recent
Formula
How the calculation works
The calculator adds 46.7 to your average blood glucose in mg/dL from a meter or continuous monitor.
It divides that sum by 28.7 to estimate the HbA1c percentage you would likely see on a lab report.
It then labels the result as normal below 5.7, prediabetes from 5.7 to 6.5 or diabetes above 6.5.
Common mistakes
- Using a single fasting reading instead of a two to three month average, which makes the estimate swing wildly.
- Mixing mg/dL and mmol/L values, since this formula expects the glucose figure in mg/dL only.
When to use it
- Use it between lab tests to see how your recent glucose readings translate into an estimated HbA1c.
- Use it to track whether diet and medication changes are moving your estimated HbA1c toward the normal band.
Worked example
An average glucose of 154 mg/dL gives eHbA1c = (154 + 46.7) / 28.7 = 7.0 percent, which falls in the diabetes band above 6.5.
Common questions
Is this estimated HbA1c the same as a lab test?
No, it is an estimate from your average glucose readings and can differ from a lab result, so treat it as a guide and not a diagnosis.
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