What A1C level should I aim for?
ADA recommends below 7% for most adults with diabetes. Older adults may target 7-8%. Pregnant women should aim for 6.5% or lower.
Health Fitness
A1C to Blood Sugar Calculator
Calculate a1c to blood sugar with your details.
Personalized estimate
Use realistic inputs for the most useful results.
What this calculator does
An A1C to blood sugar calculator converts your A1C test result into estimated average blood glucose in mg/dL and mmol/L. A1C measures the percentage of red blood cells coated with glucose over 2-3 months, making it a reliable indicator of long-term blood sugar control.
How it works
The calculator uses the established medical formula: Average Blood Glucose = (28.7 × A1C) - 46.7 for mg/dL, then divides by 18 for mmol/L. This is based on clinical research showing correlation between A1C and average daily glucose.
Formula
Average Glucose (mg/dL) = 28.7 × A1C(%) - 46.7. Average Glucose (mmol/L) = mg/dL ÷ 18. Example: A1C 7% = (28.7 × 7) - 46.7 = 154.2 mg/dL or 8.6 mmol/L.
Tips for using this calculator
- Check A1C every 3-6 months if diabetic
- A 1% A1C reduction significantly reduces complications
- A1C is affected by red blood cell lifespan
- Even if A1C is in target, glucose variability still affects health
- Consider continuous glucose monitors for detailed patterns
Frequently asked questions
Why do different units exist?
US uses mg/dL; most other countries use mmol/L. Conversion: divide mg/dL by 18. For example, 180 mg/dL = 10 mmol/L.
Can A1C be high if daily readings are normal?
Rarely, but yes. Undetected spikes between checks or conditions affecting red blood cells can cause discrepancies. CGMs help reveal patterns.