eAG to A1C Calculator

Category: Diabetes
- April 07, 2025
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Convert between estimated Average Glucose (eAG) and Hemoglobin A1C values. This calculator helps patients and healthcare providers translate between blood glucose measurements.

Conversion Calculator

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About A1C and eAG

Hemoglobin A1C (HbA1c) is a measure of a person's average blood glucose levels over the past 2-3 months. Estimated Average Glucose (eAG) is a way to translate A1C results into the same units used for daily blood glucose monitoring.

Understanding the Units
  • A1C: Measured as a percentage representing the amount of hemoglobin with glucose attached.
  • eAG: Can be expressed as mg/dL (used in the US) or mmol/L (used internationally).
  • Conversion: 1 mmol/L = 18 mg/dL
Common Target Ranges
  • Non-diabetic: A1C below 5.7% (eAG below 117 mg/dL or 6.5 mmol/L)
  • Prediabetes: A1C 5.7-6.4% (eAG 117-140 mg/dL or 6.5-7.8 mmol/L)
  • Diabetes: A1C 6.5% or higher (eAG 140 mg/dL or higher, or 7.8 mmol/L or higher)
  • Target for many adults with diabetes: A1C below 7.0% (eAG below 154 mg/dL or 8.6 mmol/L)
Important Notes
  • Individual target ranges should be determined by healthcare providers.
  • The correlation between A1C and eAG can vary slightly between individuals.
  • Certain medical conditions can affect the accuracy of A1C measurements (e.g., hemoglobinopathies, anemia, recent blood loss).
  • This calculator uses the formula derived from the ADAG study published in 2008.
A1C (%) = (eAG (mg/dL) + 46.7) ÷ 28.7
eAG (mg/dL) = (28.7 × A1C) - 46.7

What Is the eAG to A1C Calculator?

The eAG to A1C Calculator is a simple and helpful tool that lets you convert between estimated Average Glucose (eAG) and Hemoglobin A1C (HbA1c)

It works in two directions:

  • Convert eAG to A1C – Turn your average glucose readings into an estimated A1C value.
  • Convert A1C to eAG – Translate your lab A1C results into everyday glucose numbers.

Why Use This Calculator?

Understanding the relationship between A1C and average glucose levels helps with managing diabetes more effectively. This tool is especially useful because:

  • It shows how lab results connect with daily glucose readings.
  • It’s quick and easy to switch between units: mg/dL and mmol/L.
  • It supports clearer conversations between patients and healthcare providers.
  • It aids in tracking progress and setting goals with the help of HbA1c conversion.

Whether you're using it as a blood sugar estimator or part of your diabetes management aid, this calculator brings clarity to your numbers.

How to Use the Calculator

  1. Select the direction of conversion:
    • eAG to A1C (default)
    • A1C to eAG
  2. Enter your value:
    • If converting eAG, choose your unit (mg/dL or mmol/L).
    • If converting A1C, just enter the percentage value.
  3. Choose how many decimal places you want in the result.
  4. Click the Calculate button to view results.
  5. Review the displayed result and step-by-step explanation.
  6. Click Reset to clear and start over anytime.

How the Calculator Helps

This calculator is more than just a number converter—it acts as a glycemic control tracker and provides glucose level insights based on real formulas from scientific research. Here’s how it supports users:

  • Patients can understand lab results and daily blood sugar readings more clearly.
  • Healthcare providers can explain goals and progress using relatable numbers.
  • It helps bridge the gap between short-term glucose checks and long-term health indicators.

FAQ

What is A1C?

A1C is a blood test that shows your average blood sugar over the last 2–3 months. It's measured as a percentage.

What is eAG?

Estimated Average Glucose (eAG) is your A1C result expressed in the same units used by glucose meters—either mg/dL or mmol/L.

How accurate is the conversion?

The calculator uses the standard formula developed in the ADAG study. While it gives a reliable estimate, personal factors may cause slight differences.

Can I use this tool for medical decisions?

This tool supports blood glucose measurement awareness, but it’s always best to work with your healthcare provider for diagnosis or treatment decisions.

What units are supported?

You can convert between:

  • mg/dL – commonly used in the United States.
  • mmol/L – widely used internationally.

Related Tools You May Find Useful

If you’re managing diabetes, consider using additional tools such as:

  • Insulin Dosage Calculator – for calculating insulin needs.
  • HOMA-IR Calculator – for assessing insulin resistance.
  • QUICKI Calculator – for measuring insulin sensitivity.
  • Blood Sugar Converter Calculator – to switch between mg/dL and mmol/L.
  • Diabetes Risk Calculator – to evaluate your risk based on known factors.

These tools, together with the eAG to A1C Calculator, provide helpful insights for better health tracking and glucose monitoring.