Free tool
HbA1c to average blood sugar (eAG) calculator
Enter your HbA1c percentage to see the estimated average glucose (eAG) it corresponds to, in mg/dL and mmol/L, along with the IFCC mmol/mol value and where it falls on the standard adult reference bands. Nothing is stored or sent.
Estimated average glucose
General information only, not a diagnosis. Reference ranges vary slightly by laboratory, method, age and sex, and this calculator uses a standard adult, non-pregnant range. Go by the range and flag printed on your own lab report, and discuss your result with your doctor.
Standard HbA1c reference bands (adult, non-pregnant)
| Category | HbA1c (%) | HbA1c (mmol/mol) | Approx. eAG (mg/dL) |
|---|---|---|---|
| Normal | Below 5.7 | Below 39 | Below 117 |
| Prediabetes | 5.7 to 6.4 | 39 to 47 | 117 to 137 |
| Diabetes | 6.5 and above | 48 and above | 137 and above |
These are the commonly used ADA/WHO diagnostic bands for a non-pregnant adult. A single HbA1c result is usually confirmed with a repeat test or a fasting/random glucose test before a diagnosis is made. Pregnancy, certain anaemias and some haemoglobin variants can affect HbA1c accuracy; your lab report and doctor override this general table.
Common questions
What is a normal HbA1c level?
For most non-pregnant adults, an HbA1c below 5.7% is considered normal. 5.7% to 6.4% is the prediabetes range, and 6.5% or above is the diagnostic threshold used for diabetes. These are standard laboratory bands; your own report may print a slightly different range depending on the method used.
What does eAG mean on a diabetes report?
eAG stands for estimated average glucose. It is the average blood sugar level, in mg/dL or mmol/L, that a given HbA1c percentage corresponds to over roughly the previous two to three months. Labs calculate it from HbA1c using a standard published formula (the ADAG formula), not a separate blood draw.
Can HbA1c and eAG values vary between labs?
Yes. Assay methods, calibration and instrumentation differ slightly between laboratories, and the ADAG formula itself is an average relationship, not exact for every individual (conditions like anaemia or certain haemoglobin variants can shift it). Always go by the reference range and result printed on your own lab report, and discuss the result with your doctor.
Run a diagnostic lab?
HealthFlow generates HbA1c reports like this, automatically
- Adaptive, branded HbA1c/eAG reports with the reference range printed next to every value and Low/Normal/High flags applied automatically, no manual lookup.
- Reports go out on WhatsApp from your own lab’s branded number, white-labelled and QR-verified so patients can confirm the authentic copy.
- If a doctor referred the patient, HealthFlow works out their commission automatically and adds it to that doctor’s Pay-Run statement.
This is the same reporting engine behind every diabetes panel HealthFlow labs run. See the full platform on the lab information system page →
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