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Free A1C calculator. Instantly convert A1C% to estimated average glucose (eAG) in mg/dL or mmol/L — and back. Includes normal range chart, formula, and plain-English interpretation.
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#0EA5E9
Cerulean
14, 165, 233
199, 89, 48
94, 29, 0, 9
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Ebony
15, 23, 42
222, 47, 11
64, 45, 0, 84
#F8FAFC
Catskill White
248, 250, 252
210, 40, 98
2, 1, 0, 1
A1C Calculator is a free online health tool that helps users understand the relationship between A1C and estimated average glucose (eAG). Its calculator converts A1C percentages to glucose values in mg/dL or mmol/L, and also works in reverse, accepting eAG readings in either unit. Results include both glucose units, a color-coded status, and a plain-English interpretation.
The site explains the ADA-based ADAG formula behind its conversions and provides reference charts showing common A1C levels, corresponding eAG values, and clinical classifications. Its educational resources include a guide to what A1C measures, worked calculation examples, answers to frequently asked questions, and general information on testing and target ranges. Users can also explore related diabetes tools for estimating A1C from glucose readings, converting blood sugar units, and viewing A1C ranges by age.
A1C Calculator is designed for quick, accessible health information without signup. The site emphasizes that its tools are educational, not a substitute for medical advice, diagnosis, or treatment, and encourages users to discuss results and individual targets with a healthcare provider.
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