Medical Disclaimer

General Disclaimer

The information provided on a1ccalculation.com, including all calculators, charts, tables, articles, and other content, is for educational and informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment.

Always seek the advice of your physician, endocrinologist, or other qualified healthcare provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.

Calculator Accuracy

Our calculators use formulas based on published medical research:

• The ADAG formula (eAG = 28.7 × A1C − 46.7) is based on the study by Nathan DM et al., "Translating the A1C assay into estimated average glucose values," published in Diabetes Care, 2008.
• The IFCC/NGSP conversion formula is based on the master equation from the International Federation of Clinical Chemistry (IFCC) and the National Glycohemoglobin Standardization Program (NGSP).
• The diagnostic thresholds (Normal, Prediabetes, Diabetes) are based on the American Diabetes Association (ADA) Standards of Medical Care in Diabetes.

While these formulas are clinically validated, calculator results are estimates. Individual variation exists, and several conditions can affect the accuracy of A1C-based calculations, including anemia, hemoglobin variants, kidney disease, pregnancy, and recent blood loss or transfusion.

Not a Diagnostic Tool

The calculators on this website are not diagnostic tools. They cannot diagnose diabetes, prediabetes, or any other medical condition. Diagnosis of diabetes requires laboratory testing performed by qualified healthcare professionals, typically including at least two confirmatory tests on separate occasions.

No Doctor-Patient Relationship

Use of this website does not create a doctor-patient or other healthcare professional-patient relationship. The content provided does not constitute the practice of medicine or other professional healthcare service, including the giving of medical advice.

Emergency Situations

If you think you may have a medical emergency, call your doctor or emergency services immediately. Do not rely on information from this website in an emergency situation.

External Links

This website may contain links to external websites for reference purposes. We do not control, endorse, or assume responsibility for the content of external websites. The inclusion of any link does not imply endorsement.

Data Privacy

All calculations performed on this website happen entirely in your browser. No health data, A1C values, blood sugar readings, or personal health information is sent to our servers or any third party. Your health data remains completely private.

References

Our formulas and medical information are based on the following sources:

1. Nathan DM, Kuenen J, Borg R, Zheng H, Schoenfeld D, Heine RJ. "Translating the A1C assay into estimated average glucose values." Diabetes Care. 2008;31(8):1473-1478.
2. American Diabetes Association. "Standards of Medical Care in Diabetes." Diabetes Care. Published annually.
3. National Glycohemoglobin Standardization Program (NGSP). ngsp.org
4. Centers for Disease Control and Prevention. Diabetes. cdc.gov/diabetes
5. National Institute of Diabetes and Digestive and Kidney Diseases. niddk.nih.gov