Hemoglobin A1c Calculator

Hemoglobin A1c (HbA1c) and Estimated Average Glucose (eAG) Converter

Enter your HbA1c percentage.

Enter your eAG in milligrams per deciliter.

Enter your eAG in millimoles per liter.

function calculateA1c() { var hba1c = parseFloat(document.getElementById('hba1cInput').value); var eagMgdl = parseFloat(document.getElementById('eagMgdlInput').value); var eagMmol = parseFloat(document.getElementById('eagMmolInput').value); var resultDiv = document.getElementById('result'); var calculatedHba1c, calculatedEagMgdl, calculatedEagMmol; var inputCount = 0; if (!isNaN(hba1c)) inputCount++; if (!isNaN(eagMgdl)) inputCount++; if (!isNaN(eagMmol)) inputCount++; if (inputCount === 0) { resultDiv.innerHTML = "Please enter a value in at least one field."; resultDiv.style.backgroundColor = '#fff3cd'; resultDiv.style.color = '#856404'; return; } else if (inputCount > 1) { resultDiv.innerHTML = "Please enter a value in ONLY ONE field to perform the conversion."; resultDiv.style.backgroundColor = '#f8d7da'; resultDiv.style.color = '#721c24'; return; } if (!isNaN(hba1c)) { // Calculate eAG from HbA1c calculatedHba1c = hba1c; calculatedEagMgdl = (28.7 * hba1c) – 46.7; calculatedEagMmol = calculatedEagMgdl / 18; } else if (!isNaN(eagMgdl)) { // Calculate HbA1c and eAG (mmol/L) from eAG (mg/dL) calculatedEagMgdl = eagMgdl; calculatedHba1c = (eagMgdl + 46.7) / 28.7; calculatedEagMmol = eagMgdl / 18; } else if (!isNaN(eagMmol)) { // Calculate HbA1c and eAG (mg/dL) from eAG (mmol/L) calculatedEagMmol = eagMmol; calculatedEagMgdl = eagMmol * 18; calculatedHba1c = (calculatedEagMgdl + 46.7) / 28.7; } else { resultDiv.innerHTML = "Invalid input. Please enter a valid number."; resultDiv.style.backgroundColor = '#f8d7da'; resultDiv.style.color = '#721c24'; return; } resultDiv.innerHTML = "Results:" + "HbA1c: " + calculatedHba1c.toFixed(1) + " %" + "eAG: " + calculatedEagMgdl.toFixed(0) + " mg/dL" + "eAG: " + calculatedEagMmol.toFixed(1) + " mmol/L"; resultDiv.style.backgroundColor = '#e9f7ef'; resultDiv.style.color = '#155724'; } function clearFields() { document.getElementById('hba1cInput').value = "; document.getElementById('eagMgdlInput').value = "; document.getElementById('eagMmolInput').value = "; document.getElementById('result').innerHTML = "Enter a value in any field and click 'Calculate' to see the conversions."; document.getElementById('result').style.backgroundColor = '#e9f7ef'; document.getElementById('result').style.color = '#155724'; }

Understanding Hemoglobin A1c (HbA1c) and Estimated Average Glucose (eAG)

The Hemoglobin A1c (HbA1c) test is a crucial blood test for managing and diagnosing diabetes. It provides an average of your blood glucose (sugar) levels over the past two to three months. Unlike daily blood glucose readings, which show immediate levels, HbA1c offers a longer-term picture of glucose control.

What is HbA1c?

Hemoglobin is a protein found in red blood cells that carries oxygen. When glucose enters the bloodstream, it attaches to hemoglobin. This process is called glycation. The more glucose in your blood, the more it attaches to hemoglobin. The HbA1c test measures the percentage of hemoglobin that has glucose attached to it.

• Normal HbA1c: Below 5.7%
• Prediabetes: 5.7% to 6.4%
• Diabetes: 6.5% or higher

Lowering your HbA1c can significantly reduce the risk of diabetes complications such as heart disease, kidney disease, nerve damage, and vision problems.

What is Estimated Average Glucose (eAG)?

While HbA1c is expressed as a percentage, many people are more familiar with blood glucose levels measured in mg/dL (milligrams per deciliter) or mmol/L (millimoles per liter), which are used for daily monitoring. Estimated Average Glucose (eAG) is a term that converts your HbA1c percentage into a number that looks like your daily blood glucose readings. This makes it easier to understand what your HbA1c result means in terms of average daily blood sugar.

The relationship between HbA1c and eAG is based on a formula derived from studies that compared HbA1c results with average blood glucose levels measured frequently over time.

Why Convert Between HbA1c and eAG?

Converting between HbA1c and eAG can be very helpful for several reasons:

• Better Understanding: If you're used to seeing your blood sugar in mg/dL or mmol/L, eAG provides a more intuitive understanding of your long-term control.
• Communication with Healthcare Providers: It facilitates discussions with your doctor, as you can relate your HbA1c to the daily readings you take.
• Goal Setting: It helps in setting realistic blood glucose targets based on your HbA1c goals.

How to Use the Calculator

Our Hemoglobin A1c and eAG Converter simplifies the process of understanding your blood glucose metrics. Simply enter one of the following values into the corresponding field:

1. Your HbA1c percentage (e.g., 6.5)
2. Your Estimated Average Glucose in mg/dL (e.g., 140)
3. Your Estimated Average Glucose in mmol/L (e.g., 7.8)

Click 'Calculate', and the tool will instantly provide the equivalent values for the other two metrics. This allows you to quickly see how your long-term control (HbA1c) translates to average daily blood sugar (eAG) and vice-versa.

Example Conversions:

• If your HbA1c is 6.5%, your eAG is approximately 140 mg/dL or 7.8 mmol/L.
• If your eAG is 154 mg/dL, your HbA1c is approximately 7.0%, and your eAG in mmol/L is 8.6 mmol/L.
• If your eAG is 6.5 mmol/L, your HbA1c is approximately 5.7%, and your eAG in mg/dL is 117 mg/dL.

Disclaimer: This calculator is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider for any health concerns or before making any decisions related to your health or treatment.