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HbA1c to estimated average glucose (eAG) calculator

Convert HbA1c to estimated average glucose in mg/dL and mmol/L, and to IFCC units, with the ADA classification.

For doctors and health professionals

A tool to support the clinical decisions of doctors and health professionals, not for self-diagnosis or self-treatment.

This calculator is inside the patient's file in Clinicato: open it from "Medical tools" while you chart the visit, it fills in from the patient's details and vital signs where they are recorded, and adds its result to the visit's plan in one tap, with the "Medical tools" add-on. Try it in your clinic

Calculator

Medical note: The result supports a clinical decision, it does not replace the doctor's judgement or examining the patient, and is to be checked against your reference before any treatment decision.

How it works and when to use it

The calculator uses the ADAG study equation: eAG (mg/dL) = 28.7 × HbA1c − 46.7, and in mmol/L = 1.59 × HbA1c − 2.59, and converts to IFCC units in mmol/mol.

ADA classes: under 5.7% normal, 5.7 to 6.4% prediabetes, 6.5% or more diabetes range, with a diagnosis confirmed by a second test unless the symptoms are clear.

Reference: Nathan DM et al. (ADAG). Diabetes Care 2008;31:1473-8; IFCC: Hoelzel W et al. Clin Chem 2004;50:166-74; ranges: ADA Standards of Care

Frequently asked questions

What period does HbA1c reflect?

Average glucose over about the last 2 to 3 months, as it follows the life of red blood cells.

When is HbA1c not reliable?

With anaemia and some haemoglobin disorders, after a transfusion, in pregnancy and in advanced kidney failure.

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These calculators are free here for everyone, and in Clinicato 49 medical tools work inside the patient's file with the "Medical tools" add-on: filled from the visit and the vital signs, with the result added to the visit's plan, next to appointments, prescriptions and invoices.

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