A1C Calculator
Convert A1C to average blood glucose.
Enter your values
ⓘ Live results
Results
- Estimated average glucose
- 148.5 mg/dL
- A1C
- 6.8%
- In mmol/L
- 8.24
- Category
- Diabetes range
- IFCC units
- 50.8 mmol/mol
Quick answer
A1C reflects average blood glucose over about three months; eAG (mg/dL) = 28.7 × A1C − 46.7.
eAG = 28.7 × A1C − 46.7
How to use the A1C Calculator
- 1Enter your A1C percentage from your lab report.
- 2Or enter an average glucose to work backwards.
- 3Compare against the normal, prediabetes and diabetes ranges.
Frequently asked questions
What A1C is normal?
Below 5.7%; 5.7–6.4% is prediabetes and 6.5% or above indicates diabetes.
How often should A1C be tested?
Every 3–6 months for people managing diabetes.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.