A1C Calculator
Understanding Your A1C
The A1C test, also known as the glycated hemoglobin 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 type 1 and type 2 diabetes, and for monitoring how well diabetes is being managed.
Why is A1C Important?
Unlike daily blood sugar checks that give you a snapshot of your glucose at a specific moment, the A1C test offers a broader picture. It measures the percentage of hemoglobin (a protein in red blood cells) that is coated with sugar (glycated). Since red blood cells live for about 2-3 months, the A1C test reflects your average blood sugar during that period. This long-term view helps healthcare providers assess your risk for diabetes complications and adjust treatment plans effectively.
How to Use This Calculator
This calculator estimates your A1C percentage based on your Estimated Average Glucose (eAG) value. Your eAG can be derived from frequent blood glucose monitoring (e.g., using a glucometer) or continuous glucose monitoring (CGM) data. Enter your eAG value in milligrams per deciliter (mg/dL) into the field above, and the calculator will provide an estimated A1C percentage.
Note: If your eAG is in millimoles per liter (mmol/L), you can convert it to mg/dL by multiplying by 18. For example, 7 mmol/L is approximately 126 mg/dL.
The A1C Formula
The calculator uses the following standard formula to convert eAG (in mg/dL) to A1C:
A1C (%) = (eAG + 46.7) / 28.7
Interpreting Your A1C Results
- Normal: Below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or higher
These ranges are general guidelines. Your healthcare provider will interpret your A1C results in the context of your overall health, medical history, and other factors.
Examples:
- If your eAG is 126 mg/dL, your estimated A1C is approximately 6.0% (prediabetes range).
- If your eAG is 154 mg/dL, your estimated A1C is approximately 7.0% (diabetes range).
- If your eAG is 200 mg/dL, your estimated A1C is approximately 8.6% (diabetes range).
Important Disclaimer:
This A1C calculator provides an estimate based on a widely accepted formula. It is not a substitute for a laboratory A1C test performed by a healthcare professional. Factors such as certain medical conditions (e.g., anemia, kidney disease) or medications can affect the accuracy of A1C results. Always consult with your doctor for diagnosis, treatment, and interpretation of your A1C levels.