A1C Calculator

Estimate your A1C from average blood glucose — or find the average glucose your A1C represents.

Direction

Glucose unit

Average blood glucose

The conversion
eAG (mg/dL) = 28.7 × A1C − 46.7

Typical targets
• Normal: below 5.7%
• Prediabetes: 5.7–6.4%
• Diabetes: 6.5% or higher

Estimates only — always confirm with a lab test.

💧 Both directions

Glucose to A1C and back again.

📒 mg/dL & mmol/L

eAG shown in both units.

🏁 Category check

Normal / prediabetes / diabetes.

🧬 Informational

Not a substitute for lab results.