About a1ccalculation.com

Our Mission

a1ccalculation.com provides free, accurate, and easy-to-use A1C calculators and diabetes education resources. Our goal is to help people understand their A1C test results, learn about blood sugar management, and make informed decisions about their health.

We believe that access to clear, evidence-based health information should be free and available to everyone. All calculations are performed entirely in your browser — no data is sent to any server, ensuring your health information remains completely private.

Our Calculators

All our calculators use clinically validated formulas recommended by major medical organizations:

• ADAG Formula — The A1C-Derived Average Glucose formula (eAG = 28.7 × A1C − 46.7) from the landmark study by Nathan DM et al., published in Diabetes Care (2008)
• IFCC/NGSP Conversion — Based on the master equation from the International Federation of Clinical Chemistry and the National Glycohemoglobin Standardization Program
• ADA Diagnostic Thresholds — Normal (< 5.7%), Prediabetes (5.7-6.4%), and Diabetes (≥ 6.5%) based on American Diabetes Association Standards of Care

Educational Purpose

The information on this website is provided strictly for educational and informational purposes. Our calculators and content are designed to help you:

• Understand what your A1C results mean
• Convert between different A1C units and formats
• Learn about blood sugar management strategies
• Prepare for conversations with your healthcare provider

This website is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider regarding any medical conditions or treatment decisions. Please read our full Medical Disclaimer.

Our Sources

We base our content on peer-reviewed research and guidelines from leading medical organizations:

• American Diabetes Association (ADA) — Standards of Medical Care in Diabetes
• Nathan DM et al. — "Translating the A1C assay into estimated average glucose values" (Diabetes Care, 2008)
• National Glycohemoglobin Standardization Program (NGSP)
• Centers for Disease Control and Prevention (CDC)
• National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)