Health & Fitness
Convert A1C percentage to estimated average blood glucose
Last reviewed: How we build & verify
%
Disclaimer
Educational estimate only, not medical advice or a diagnosis. Diagnosis requires confirmatory testing by a clinician. A1C can be unreliable with anemia, hemoglobin variants, recent transfusion or pregnancy, and individual targets vary. Valid input range is 3-20%.
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Frequently Asked Questions
No. A1c Calculator is free, with no signup required, and nothing you enter leaves your browser.
A1c Calculator is built on published formulas and reference ranges from established health sources. We revisit it periodically as guidance evolves; the "Last reviewed" date above shows when that last happened. If something looks wrong, tell us with the feedback button in the bottom-right corner.