A1C from Average Blood Glucose Calculator
Use this calculator to estimate your A1C percentage based on your average blood glucose readings (eAG).
Estimated A1C: " + estimatedA1C.toFixed(2) + "%
" + "This is an estimate based on your average blood glucose. Always consult with a healthcare professional for accurate diagnosis and management."; } .a1c-calculator-container { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f9f9f9; border: 1px solid #ddd; border-radius: 8px; padding: 25px; max-width: 600px; margin: 20px auto; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); color: #333; } .a1c-calculator-container h2 { color: #2c3e50; text-align: center; margin-bottom: 20px; font-size: 1.8em; } .a1c-calculator-container p { font-size: 1em; line-height: 1.6; margin-bottom: 15px; } .calculator-form .form-group { margin-bottom: 18px; } .calculator-form label { display: block; margin-bottom: 8px; font-weight: bold; color: #555; font-size: 1.05em; } .calculator-form input[type="number"] { width: calc(100% – 22px); padding: 12px; border: 1px solid #ccc; border-radius: 5px; font-size: 1.1em; box-sizing: border-box; transition: border-color 0.3s ease; } .calculator-form input[type="number"]:focus { border-color: #007bff; outline: none; box-shadow: 0 0 5px rgba(0, 123, 255, 0.3); } .calculator-form button { background-color: #007bff; color: white; padding: 12px 25px; border: none; border-radius: 5px; cursor: pointer; font-size: 1.1em; font-weight: bold; display: block; width: 100%; margin-top: 20px; transition: background-color 0.3s ease, transform 0.2s ease; } .calculator-form button:hover { background-color: #0056b3; transform: translateY(-2px); } .result-container { margin-top: 25px; padding: 15px; background-color: #e9f7ff; border: 1px solid #b3e0ff; border-radius: 8px; text-align: center; font-size: 1.15em; color: #333; } .result-container h3 { color: #2c3e50; margin-top: 0; margin-bottom: 10px; font-size: 1.6em; } .result-container span { font-weight: bold; } .result-container p { font-size: 0.9em; color: #666; margin-bottom: 0; }Understanding A1C and Average Blood Glucose (eAG)
The A1C test, also known as the hemoglobin A1C or HbA1c test, is a crucial blood test that provides an average of your blood glucose (sugar) levels over the past two to three months. It's a key indicator for diagnosing prediabetes and diabetes, and for monitoring how well diabetes is being managed.
What is A1C?
Hemoglobin is a protein in your red blood cells that carries oxygen. When glucose enters your bloodstream, it attaches to hemoglobin. The more glucose in your blood, the more glucose will attach to your hemoglobin. The A1C test measures the percentage of hemoglobin in your red blood cells that is coated with sugar (glycated).
- Normal A1C: Below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or higher
These ranges are general guidelines, and your doctor will interpret your results in the context of your overall health.
What is Average Blood Glucose (eAG)?
Estimated Average Glucose (eAG) is a term used to report your A1C test results in the same units (mg/dL or mmol/L) that you're used to seeing in your daily blood sugar monitoring. This makes it easier to understand the relationship between your A1C and your day-to-day blood sugar levels. While A1C is a percentage, eAG translates that percentage into an average blood sugar number, similar to what you might see on a glucose meter.
The Relationship Between A1C and eAG
There's a direct mathematical relationship between A1C and eAG. This calculator uses a widely accepted formula to convert an average blood glucose value (eAG) into an estimated A1C percentage. This conversion is useful for understanding what your A1C might be if your average blood sugar has been consistent over a period.
How the Calculator Works
This calculator uses the following formula to estimate A1C from average blood glucose (eAG) in mg/dL:
Estimated A1C (%) = (eAG in mg/dL + 46.7) / 28.7
For example, if your average blood glucose (eAG) is 154 mg/dL:
Estimated A1C = (154 + 46.7) / 28.7 = 200.7 / 28.7 ≈ 6.99%
This means an average blood glucose of 154 mg/dL over 2-3 months would correspond to an A1C of approximately 7.0%.
Why is this important?
Knowing your A1C helps you and your healthcare provider assess your risk for diabetes complications. Maintaining an A1C within your target range can significantly reduce the risk of long-term problems affecting your eyes, kidneys, nerves, and heart.
Important Considerations
- This is an estimate: The calculator provides an estimation. Actual A1C results from a lab test can vary due to individual physiological differences and other factors.
- Consult your doctor: Always discuss your blood glucose readings and A1C results with your healthcare provider. They can provide personalized advice and treatment plans.
- Not for diagnosis: This calculator is not a diagnostic tool. A formal A1C test performed in a lab is required for diagnosis.
Examples of A1C and eAG Equivalents:
| A1C (%) | eAG (mg/dL) | eAG (mmol/L) |
|---|---|---|
| 5.0 | 97 | 5.4 |
| 5.7 | 117 | 6.5 |
| 6.0 | 126 | 7.0 |
| 6.5 | 140 | 7.8 |
| 7.0 | 154 | 8.6 |
| 8.0 | 183 | 10.2 |
| 9.0 | 212 | 11.8 |
| 10.0 | 240 | 13.4 |
| 11.0 | 269 | 14.9 |
| 12.0 | 298 | 16.5 |
Note: eAG in mmol/L is approximately eAG in mg/dL divided by 18.