HbA1c Test Results Explained: What Your Number Means

HbA1c results, explained

Enter your value to see whether it falls in the typical range and what that means. This is an educational explainer — not a diagnosis, and your entry never leaves your browser.

Enter your HbA1c value

Some countries report in mmol/mol; this interpreter uses the % (NGSP) scale.

This is educational, not a diagnosis. Reference ranges vary between labs and assays — the range printed on your report is the one that applies to you, and a single value is interpreted with your history and symptoms by a clinician. Your entry stays in your browser; nothing is stored or sent anywhere.

Reference ranges: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) — The A1C Test & Diabetes. View source

What HbA1c measures

HbA1c reflects your average blood sugar over roughly the past 2–3 months, by measuring how much glucose is attached to hemoglobin.

Why the test is done

To screen for and diagnose prediabetes and type 2 diabetes, and to monitor blood-sugar control over time.

Typical reference ranges

Typical adult reference bands for HbA1c (%)
Band	What it may mean
Normal range	An HbA1c below 5.7% is in the normal (non-diabetes) range.
Prediabetes range	An HbA1c of 5.7–6.4% falls in the prediabetes range — a signal that blood sugar is higher than ideal and worth addressing with a clinician, often through lifestyle changes.
Diabetes range	An HbA1c of 6.5% or higher is in the range used to diagnose diabetes, usually confirmed with a repeat test. Your clinician will interpret it in context.

Ranges shown are typical adult values from NIDDK, National Institutes of Health; your own lab's printed range applies to you. View source.

Frequently asked questions

What is a normal HbA1c?

Below 5.7% is normal, 5.7–6.4% is the prediabetes range, and 6.5% or higher is the range used to diagnose diabetes (usually confirmed with a repeat test).