A1C ↔ Average Glucose Calculator
Convert HbA1c to estimated average glucose, both ways
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A1C ↔ Average Glucose Calculator
HbA1c reflects your average blood glucose over the past 2–3 months. This converter uses the ADAG study formula (eAG mg/dL = 28.7 × A1C − 46.7) to translate an A1C percentage into estimated average glucose in mg/dL and mmol/L, and back again. It also flags the normal, prediabetes and diabetes ranges. Results are an estimate for education only and do not replace a clinical test.
Estimate only (ADAG formula). Not a diagnosis — consult a healthcare professional.
Frequently Asked Questions
- What is HbA1c to average glucose conversion?
- It translates your HbA1c percentage into estimated average glucose (eAG), the typical blood sugar level over the past 2-3 months. An A1C of 6.0% maps to about 126 mg/dL (7.0 mmol/L), making lab results easier to relate to daily glucose readings.
- How do you convert A1C to average glucose?
- The widely used ADAG formula is eAG (mg/dL) = 28.7 x A1C - 46.7. Divide mg/dL by 18 to get mmol/L. Just enter your A1C percentage and the calculator returns both units instantly; it can also work the conversion in reverse.
- What A1C level is considered normal?
- Below 5.7% is generally normal, 5.7-6.4% indicates prediabetes, and 6.5% or higher suggests diabetes. Many people with diabetes aim for under 7%. eAG is an estimate of your average, not a substitute for a meter; discuss targets with your doctor.