Educational estimates only
Every result on this site is an estimate produced by the ADAG conversion formula, which reflects a population average. Your own glucose-to-A1C relationship can differ, sometimes meaningfully, because of red blood cell lifespan, anemia, kidney disease, pregnancy, or other factors. Estimates are for education and tracking, not for diagnosis or treatment decisions.
Not medical advice
Nothing on this site constitutes medical advice, a diagnosis, or a treatment plan. Only a qualified clinician can interpret a blood test in the context of your full health picture. If you believe you have diabetes, if your A1C or glucose is out of range, or if you are thinking of changing any medication or lifestyle plan, talk to a doctor first.
No patient relationship
Using this calculator does not create any clinician-patient, doctor-patient, or advisory relationship. There is no way for a website to know your history, and this one does not try. It gives you a number and a plain-language explanation of what that number usually means.
Accuracy of the underlying data
The formulas and reference ranges are maintained against current ADA guidance and reviewed annually. We make every effort to keep them current and correct, but clinical guidance can change, and the site is provided as is, without warranty. See the methodology for the exact math and editorial policy for how corrections are handled.