Tooldeon

HbA1c converter

Enter an HbA1c in percent or in mmol/mol to get the other unit and the estimated average glucose (eAG). The formulas are the published ones; the result is a unit conversion and an estimate, not a diagnosis.

Your HbA1c is in
%
HbA1c in mmol/mol53 mmol/mol
Estimated average glucose (mg/dL)
154 mg/dL
Estimated average glucose (mmol/L)
8.6 mmol/L

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How to use it

  1. Choose the unit of your result: percent (used in the US and many labs) or mmol/mol (used in the UK, Europe and elsewhere).
  2. Type the value.
  3. Read the other unit and the estimated average glucose in mg/dL and mmol/L.

Formulas

  • IFCC (mmol/mol) = (NGSP % − 2.15) × 10.929, the IFCC–NGSP master equation.
  • eAG (mg/dL) = 28.7 × HbA1c − 46.7, from the ADAG study as published by the American Diabetes Association.
  • eAG (mmol/L) = eAG (mg/dL) ÷ 18.016.

Worked example

HbA1c 7 %: IFCC = 4.85 × 10.929 = 53 mmol/mol. eAG = 28.7 × 7 − 46.7 = 154 mg/dL, which is 154.2 ÷ 18.016 = 8.6 mmol/L.

Notes

eAG is an estimate from a formula and is not the same as a daily meter reading. Results are rounded for display. This tool does not diagnose or monitor anything; talk to a doctor about your HbA1c.

Frequently asked questions

How do I convert HbA1c from % to mmol/mol?

IFCC mmol/mol = (HbA1c % − 2.15) × 10.929. For example 7 % gives (7 − 2.15) × 10.929 = 53 mmol/mol.

What is eAG?

Estimated average glucose is the average blood glucose that an HbA1c value corresponds to in the ADAG study. The American Diabetes Association gives eAG (mg/dL) = 28.7 × HbA1c − 46.7. Dividing by 18.016 gives mmol/L.

Why can my meter average differ from the eAG?

eAG is a population-level estimate. Individual red blood cell lifespan and glucose swings mean your own average readings may differ from it.

What HbA1c is normal or good?

This tool does not interpret results. Targets depend on the person, so talk to a doctor about yours.

Why does the tool refuse values below 4 % or above 15 %?

The conversion formulas are meant for the usual clinical range. Outside it the estimate is not meaningful, so check the number and ask a doctor.

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