A1C to Average Blood Glucose Converter
Use this calculator to estimate your A1C percentage from your average blood glucose (eAG) or vice versa. Enter a value in one field, and the calculator will provide the equivalent in the other.
Understanding A1C and Average Blood Glucose (eAG)
The A1C test, also known as the hemoglobin A1c or HbA1c test, is a common blood test used to diagnose type 1 and type 2 diabetes and to monitor how well you're managing your diabetes. It measures your average blood sugar levels over the past two to three months.
What is A1C?
A1C measures the percentage of your red blood cells that have sugar-coated hemoglobin. Hemoglobin is a protein in red blood cells that carries oxygen. When sugar (glucose) enters your bloodstream, it attaches to hemoglobin. The more sugar in your blood, the more hemoglobin will be coated with sugar. Since red blood cells live for about three months, the A1C test provides a good long-term picture of your blood sugar control.
- Normal A1C: Below 5.7%
- Pre-diabetes: 5.7% to 6.4%
- Diabetes: 6.5% or higher
What is Average Blood Glucose (eAG)?
Estimated Average Glucose (eAG) is a term that translates your A1C test result into a number that is more familiar to people with diabetes: an average blood glucose level, similar to what you might see on a home blood glucose meter. This allows for an easier comparison between your A1C result and your daily blood sugar readings.
The relationship between A1C and eAG is based on a formula derived from studies that compared A1C results with average blood glucose levels measured frequently over time.
The Relationship and Formulas
The conversion between A1C and eAG is based on the following formulas:
- To calculate A1C from eAG (mg/dL):
A1C (%) = (eAG (mg/dL) + 46.7) / 28.7 - To calculate eAG (mg/dL) from A1C (%):
eAG (mg/dL) = (A1C (%) * 28.7) - 46.7
These formulas are widely accepted and used by medical professionals to help patients understand their long-term blood sugar control in terms of daily averages.
Why is this Conversion Important?
Understanding the relationship between A1C and eAG is crucial for effective diabetes management. While A1C provides a valuable long-term overview, daily blood glucose monitoring gives immediate feedback. Converting between the two helps you:
- Connect the dots: See how your daily blood sugar readings contribute to your overall A1C result.
- Set goals: Understand what average daily blood glucose level you need to achieve to reach your target A1C.
- Communicate with your doctor: Discuss your blood sugar trends and A1C results more effectively.
Examples:
Let's look at some realistic examples:
- Example 1: If your average blood glucose (eAG) over the past 2-3 months was 154 mg/dL, your estimated A1C would be:
A1C = (154 + 46.7) / 28.7 = 200.7 / 28.7 ≈ 6.99%(approximately 7.0%) - Example 2: If your A1C test result is 8.0%, your estimated average blood glucose (eAG) would be:
eAG = (8.0 * 28.7) - 46.7 = 229.6 - 46.7 = 182.9 mg/dL - Example 3: For someone aiming for an A1C of 6.5%, their average blood glucose should be around:
eAG = (6.5 * 28.7) - 46.7 = 186.55 - 46.7 = 139.85 mg/dL(approximately 140 mg/dL)
Remember, this calculator provides an estimate. Always consult with your healthcare provider for personalized medical advice and interpretation of your A1C results.