A1C to Average Glucose (eAG) Calculator

How to use

1. Choose forward (A1C → eAG) or reverse (eAG → A1C).
2. Type your value — A1C in percent, or eAG in mg/dL or mmol/L.
3. Press Convert and read both units plus the band chip.
4. Compare the colored ADA bands against your own lab report.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

The A1C test and average glucose are two views of the same three months: this converter applies the ADAG study equation (estimated average glucose = 28.7 × A1C − 46.7 mg/dL) forward from A1C to eAG in mg/dL or mmol/L, and backward from a meter or lab average back to an equivalent A1C. Color-coded chips place the result against the ADA reference bands — below 5.7 percent, 5.7 to 6.4, and 6.5 and above — so you can see where a number sits at a glance. This is an educational estimate — not medical advice. Individual red-cell turnover, anemia, pregnancy, and lab method differences can shift real results in either direction, and a formal diagnosis belongs to a clinician with laboratory tests.

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