HbA1c Chart
A complete A1C to blood glucose conversion chart — from 5.0% to 14.0%, with eAG in mg/dL and mmol/L, and clinical range classification.
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A1C to eAG Visual Chart
Bar length = eAG (mg/dL). Color = clinical range.
Normal (<5.7%)
Prediabetes (5.7–6.4%)
Diabetes (≥6.5%)
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Convert Any A1C Value Instantly
The chart shows common values — for any A1C percentage, use the full A1C Calculator for instant conversion with detailed interpretation.
Related guide
A1C Chart: Complete Reference Guide
Learn how to read and interpret A1C values, understand what different levels mean clinically, and track changes over time.
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Complete A1C to eAG Conversion Table
| A1C % | eAG (mg/dL) | eAG (mmol/L) | Range |
|---|
Formula: eAG (mg/dL) = (28.7 × A1C%) − 46.7 · Source: ADA ADAG study
How to Read This Chart
Each row in the chart corresponds to an A1C percentage and shows the equivalent estimated average glucose (eAG) in both US units (mg/dL) and international units (mmol/L). The color-coded range column indicates the clinical classification:
- Normal (green): A1C below 5.7% — blood sugar has been in the healthy range over the past 2–3 months
- Prediabetes (yellow): A1C 5.7%–6.4% — blood sugar is elevated but not yet at the diabetes threshold
- Diabetes (red): A1C 6.5% or higher — used to diagnose diabetes (requires confirmation on a second test)
The ADA target for most adults managing diabetes is below 7.0% (eAG < 154 mg/dL). Individual targets may differ — always follow your healthcare provider's recommendation.
Frequently Asked Questions
What does HbA1c mean?
HbA1c stands for glycated hemoglobin — specifically hemoglobin A1c, the fraction of hemoglobin that has glucose attached to it. The "Hb" stands for hemoglobin, "A1" refers to the specific hemoglobin subtype, and "c" identifies the glycated form. HbA1c, A1C, and glycated hemoglobin all refer to the same test. It measures your average blood sugar over the past 2–3 months.
What is a good HbA1c level?
For someone without diabetes, a good HbA1c is below 5.7% (eAG below 117 mg/dL). For people managing diabetes, the ADA recommends an HbA1c below 7.0% (eAG below 154 mg/dL) for most adults. Some people aim for tighter targets (below 6.5%) if achievable safely, while older adults or those with complex health situations may have a higher target (up to 8.0%).
How is A1C converted to blood glucose?
A1C is converted to estimated average glucose (eAG) using the ADA ADAG formula: eAG (mg/dL) = (28.7 × A1C%) − 46.7. For example, an A1C of 7.0% = (28.7 × 7.0) − 46.7 = 154 mg/dL. To convert to mmol/L, divide by 18.016: 154 ÷ 18.016 = 8.6 mmol/L. This chart shows the pre-calculated results for common A1C values.
Is A1C 7% the same as blood sugar 154 mg/dL?
Yes. An A1C of 7.0% corresponds to an eAG of approximately 154 mg/dL (8.6 mmol/L) using the ADA formula. This is the ADA's recommended target for most adults with diabetes. It's important to understand that 154 mg/dL is an average — individual readings will be higher after meals and lower when fasting.
Why does my A1C not match my meter average?
Home glucose meters typically capture readings at specific times — often fasting or before meals — which may not reflect post-meal peaks. eAG represents the true 24-hour average across all times of day, including post-meal spikes. This is why eAG is often higher than the average shown on your meter. If you use a CGM, your device's average may be a closer match to eAG.