GlenCalc

A1C calculator

A1C reflects average blood sugar over about the last three months. This converts it with the formula from the ADAG study used by the American Diabetes Association.

Your answer

A1C6.5 %Diabetes range (6.5% or more)
Estimated average glucose140 mg/dL
In mmol/L7.8 mmol/L
  • Diagnosis needs a lab test and a clinician; this is a conversion only.

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How we worked it out

Updated as you change the numbers.

  1. eAG (mg/dL) = 28.7 × A1C − 46.7.

Method and assumptions

The ADAG study found this linear relation between A1C and average glucose. ADA criteria: under 5.7% normal, 5.7 to 6.4% prediabetes, 6.5% or more diabetes.

Questions

What average blood sugar is an A1C of 6.5%?

About 140 mg/dL (7.8 mmol/L).

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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