MasterTool

A1C Converter

Convert A1C (%) to estimated average glucose (eAG) and back using the published ADAG equation — conversion only.

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What this tool does

Convert A1C (%) to estimated average glucose (eAG) and back using the published ADAG equation — conversion only. Conversion only, using the ADAG published regression. The A1C–glucose relationship varies between individuals (red-cell lifespan, anaemia and other factors); no target or diagnosis is implied by any converted value.

How to use the A1C Converter

  1. Enter or select convert.
  2. Enter or select value.
  3. Read the calculated result; change any measurement to compare alternatives.

Formula

eAG (mg/dL) = 28.7 × A1C − 46.7 (ADAG study equation, Nathan et al. 2008); inverse: A1C = (eAG + 46.7) / 28.7
mode
Convert
value
Value

Conversion only, using the ADAG published regression. The A1C–glucose relationship varies between individuals (red-cell lifespan, anaemia and other factors); no target or diagnosis is implied by any converted value.

Worked example

For a1c converter, the following measurements illustrate the exact method: Convert: a1c; Value: 7.

Inputs

  • ConvertA1C (%) → eAG
  • Value7

Result

  • Estimated average glucose eAG (mg/dL)154.2
  • eAG (mmol/L)8.56

Results explained

Estimated average glucose eAG (mg/dL)
Estimated average glucose eAG (mg/dL) from the formula above. Conversion only, using the ADAG published regression. The A1C–glucose relationship varies between individuals (red-cell lifespan, anaemia and other factors); no target or diagnosis is implied by any converted value.
eAG (mmol/L)
eAG (mmol/L) from the formula above. Conversion only, using the ADAG published regression. The A1C–glucose relationship varies between individuals (red-cell lifespan, anaemia and other factors); no target or diagnosis is implied by any converted value.

Frequently asked questions

Use the ADAG equation: eAG (mg/dL) = 28.7 × A1C − 46.7. An A1C of 7.0% gives 28.7 × 7 − 46.7 ≈ 154 mg/dL.

It comes from the A1C-Derived Average Glucose study (Nathan et al., 2008), which regressed continuous glucose monitoring data against A1C in 507 participants to produce the standard conversion used by the ADA.

Yes — invert the same equation: A1C = (eAG + 46.7) ÷ 28.7. Select the eAG → A1C mode in this tool.

The equation is a population average. Red blood cell lifespan, anaemia, recent transfusion and individual glycation rates all shift the personal A1C–glucose relationship.

No. It converts units only. A1C targets are individual and set by clinicians based on your full situation.