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A1C to Average Glucose Calculator

Choose a direction, enter your A1C or your average glucose, and get the other value. The page also shows the A1C in mmol/mol, the ADA range it falls in and a chart from 5% to 14%.

Your numbers

Result

Estimate for information only, not professional advice. Last reviewed .

How we calculate it

The estimated average glucose (eAG) comes from the ADAG study (Nathan et al., Diabetes Care, 2008) used by the American Diabetes Association: eAG in mg/dL = 28.7 × A1C − 46.7. To get mmol/L divide by 18.016. Going the other way, A1C = (eAG + 46.7) ÷ 28.7.

A1C is also reported in mmol/mol (IFCC units): mmol/mol = 10.929 × (A1C − 2.15). An A1C of 7% is 53 mmol/mol, an average glucose of about 154 mg/dL (8.6 mmol/L).

The ADA groups results as below 5.7% (not in the prediabetes range), 5.7% to 6.4% (prediabetes) and 6.5% or higher (diabetes, when confirmed by a doctor).

Assumptions and limits

  • This is an estimate. It is not a diagnosis and not medical advice. Diagnosis needs a lab test confirmed by a doctor.
  • The formula is an average across many people. Your own daily readings can be higher or lower than the eAG for your A1C. Anemia, kidney disease, pregnancy and some hemoglobin variants affect A1C.
  • Your target A1C depends on your age, health and medicines. Ask your doctor.
  • Sources: Nathan et al., "Translating the A1C assay into estimated average glucose values", Diabetes Care 2008 (PubMed 18540046), and the American Diabetes Association eAG calculator (28.7 × A1C − 46.7); ADA Standards of Care in Diabetes 2026 and CDC (prediabetes 5.7% to 6.4%, diabetes 6.5% or higher); NGSP and the IFCC Network (mmol/mol conversion).

Frequently asked questions

What does an A1C of 7% mean in average glucose?

About 154 mg/dL, or 8.6 mmol/L, using the ADAG formula 28.7 × 7 − 46.7.

What is a normal A1C?

The ADA considers an A1C below 5.7% to be below the prediabetes range, 5.7% to 6.4% prediabetes and 6.5% or higher diabetes.

Why does my meter average not match my A1C?

A1C reflects about three months of glucose weighted toward recent weeks, and it depends on red blood cell life. Meters measure single moments, and some conditions change the A1C.

How do I convert A1C to mmol/mol?

Multiply (A1C − 2.15) by 10.929. For 7% that gives 53 mmol/mol.

How often should I have an A1C test?

That depends on your treatment and control. Many people have it twice a year when stable and four times a year when not. Your doctor will say.

Related calculators

Worked example (a fixed example using the starting numbers, it does not change as you type)

Inputs: Convert = A1C to average glucose; A1C (%) = 7.

  • A1C 7%
  • Average glucose (mg/dL) 154 mg/dL
  • Average glucose (mmol/L) 8.6 mmol/L
  • A1C in mmol/mol (IFCC) 53
  • ADA category Diabetes range (6.5% or higher)

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Last reviewed: . Formulas and assumptions are described on our methodology page. For information only; not professional advice.