Enter average glucose to estimate A1C…
Estimates A1C (%) from average blood glucose using the ADA formula: A1C = (Avg Glucose + 46.7) / 28.7. A1C reflects average blood sugar over 2–3 months.
An A1C calculator is a helpful tool that converts your Hemoglobin A1C (%) reading into your estimated average glucose (eAG) levels, measured in mg/dL (US standard) or mmol/L (international standard). This calculator helps individuals with diabetes track long-term glucose control more accurately.
At GCalculate, our A1C calculator is 100% accurate, responsive, and offers a smooth interface with unit switching and a visual chart of risk levels.
The A1C test reflects your average blood sugar levels over the past 2–3 months. It’s a crucial metric used by healthcare providers to:
Diagnose prediabetes and diabetes
Monitor how well your diabetes treatment is working
Assess risk of long-term complications like heart disease, kidney damage, and vision problems
The A1C calculator uses the formula:
eAG (mg/dL) = (28.7 × A1C) – 46.7
To convert it to mmol/L, the result is divided by 18.
Our calculator simplifies this and adds a unit switcher so you can view your result in either mg/dL or mmol/L. It also includes a color-coded chart showing A1C levels, associated eAG, and health risk ranges.
| A1C (%) | eAG (mg/dL) | Risk Category |
|---|---|---|
| 5.0 | 97 | Normal |
| 5.7 | 117 | Start of Prediabetes |
| 6.5 | 137 | Diabetes Threshold |
| 7.0 | 154 | Diabetes (Managed) |
| 8.0 | 183 | Elevated Risk |
| 9.0+ | 212+ | High Risk |
Diabetic patients monitoring long-term control
Healthcare providers or nurses
People checking for early signs of diabetes
Yes! Our A1C Calculator follows the standard formula by the ADA (American Diabetes Association) and includes error-free conversions. The script is tested across major devices and browsers for full compatibility.
Follow a balanced, low-sugar diet
Engage in regular physical activity
Take medication as prescribed
Monitor A1C every 3 months
Tracking your A1C and average blood sugar levels is key to managing diabetes. With Gcalculate A1C Calculator, you get a powerful, accurate, and visual tool for better health tracking.
An A1C below 5.7% is considered normal. 5.7%–6.4% indicates prediabetes, while 6.5% or higher indicates diabetes.
Yes! GCalculate calculator lets you switch units easily for international use.
Typically every 3 months, or as advised by your doctor.
Absolutely. It supports both mg/dL (US) and mmol/L (UK, Canada, EU, etc.).