Glucose to A1c Calculator

Glucose to A1C Converter

function calculateConversion() { var glucoseInput = document.getElementById('averageGlucoseMgDl').value; var a1cInput = document.getElementById('a1cPercentage').value; var resultDiv = document.getElementById('result'); resultDiv.style.backgroundColor = '#e9f7ef'; resultDiv.style.borderColor = '#d4edda'; resultDiv.style.color = '#155724'; var glucoseVal = parseFloat(glucoseInput); var a1cVal = parseFloat(a1cInput); if (!isNaN(glucoseVal) && glucoseVal > 0 && isNaN(a1cVal)) { // Calculate A1C from Glucose var calculatedA1C = (glucoseVal + 46.7) / 28.7; resultDiv.innerHTML = 'An Average Blood Glucose (eAG) of ' + glucoseVal.toFixed(0) + ' mg/dL is estimated to be an HbA1c of ' + calculatedA1C.toFixed(1) + '%.'; document.getElementById('a1cPercentage').value = calculatedA1C.toFixed(1); } else if (!isNaN(a1cVal) && a1cVal > 0 && isNaN(glucoseVal)) { // Calculate Glucose from A1C var calculatedGlucose = (a1cVal * 28.7) – 46.7; resultDiv.innerHTML = 'An HbA1c of ' + a1cVal.toFixed(1) + '% is estimated to be an Average Blood Glucose (eAG) of ' + calculatedGlucose.toFixed(0) + ' mg/dL.'; document.getElementById('averageGlucoseMgDl').value = calculatedGlucose.toFixed(0); } else if (!isNaN(glucoseVal) && glucoseVal > 0 && !isNaN(a1cVal) && a1cVal > 0) { // Both entered, prioritize Glucose to A1C var calculatedA1C = (glucoseVal + 46.7) / 28.7; resultDiv.innerHTML = 'Based on your Average Blood Glucose (eAG) of ' + glucoseVal.toFixed(0) + ' mg/dL, the estimated HbA1c is ' + calculatedA1C.toFixed(1) + '%. (A1C input was ignored for this calculation).'; document.getElementById('a1cPercentage').value = calculatedA1C.toFixed(1); } else { resultDiv.style.backgroundColor = '#fff3cd'; resultDiv.style.borderColor = '#ffeeba'; resultDiv.style.color = '#856404'; resultDiv.innerHTML = 'Please enter a valid positive number in either the Average Blood Glucose or HbA1c field.'; } }

Understanding Your Glucose and A1C Levels

Managing blood sugar is a critical aspect of diabetes care. Two key metrics used to assess blood sugar control are Average Blood Glucose (eAG) and Hemoglobin A1c (HbA1c or A1C). While both reflect your glucose levels, they provide different perspectives, and understanding their relationship is vital for effective diabetes management.

What is HbA1c (A1C)?

The HbA1c test measures the percentage of hemoglobin in your red blood cells that is coated with sugar (glycated). Since red blood cells live for about 2-3 months, the A1C test provides an average picture of your blood sugar control over the past 2 to 3 months. It's a long-term indicator and is often used to diagnose diabetes, monitor treatment effectiveness, and assess the risk of diabetes complications.

Typical A1C Ranges:

• Normal: Below 5.7%
• Pre-diabetes: 5.7% to 6.4%
• Diabetes: 6.5% or higher

What is Average Blood Glucose (eAG)?

Average Blood Glucose (eAG) is an estimated average of your daily blood glucose levels over the same 2-3 month period that the A1C test covers. It's expressed in the same units as your daily blood glucose readings (mg/dL in the U.S. or mmol/L elsewhere), making it easier to relate to your self-monitoring results. The eAG is calculated directly from your A1C result using a specific formula.

Typical eAG Ranges (corresponding to A1C):

• Normal: Below 117 mg/dL
• Pre-diabetes: 117 mg/dL to 137 mg/dL
• Diabetes: 137 mg/dL or higher

Why Convert Between Glucose and A1C?

While A1C provides a valuable long-term average, many people with diabetes are more familiar with their daily blood glucose readings. Converting your A1C to an eAG can help you understand what your A1C percentage means in terms of your everyday blood sugar numbers. Conversely, if you consistently monitor your blood glucose, calculating an estimated A1C can give you an idea of your long-term control without waiting for a lab test.

This calculator uses the standard formula recommended by the American Diabetes Association (ADA) to provide an estimated conversion between these two important metrics.

How to Use the Calculator

Simply enter your Average Blood Glucose (eAG) in mg/dL to get an estimated HbA1c percentage, or enter your HbA1c percentage to get an estimated eAG in mg/dL. The calculator will automatically perform the conversion based on the value you provide.

Examples:

• If your average blood glucose is 126 mg/dL, your estimated A1C is approximately 6.0%.
• If your average blood glucose is 154 mg/dL, your estimated A1C is approximately 7.0%.
• If your average blood glucose is 183 mg/dL, your estimated A1C is approximately 8.0%.
• If your A1C is 7.5%, your estimated average blood glucose is approximately 168 mg/dL.

Important Considerations

This calculator provides an estimation based on a widely accepted formula. However, individual variations can occur. Factors such as certain anemias, kidney disease, or recent blood transfusions can affect A1C results. Always consult with your healthcare provider to interpret your A1C and blood glucose results and to make any decisions regarding your diabetes management plan.