Glucose to A1c Calculator

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Glucose to A1C Calculator

Estimate your Hemoglobin A1C based on your average blood glucose levels

mg/dL (USA/Standard) mmol/L (UK/International)
Estimated HbA1c
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Understanding the Glucose to A1C Conversion

This calculator uses the ADAG (A1c-Derived Average Glucose) formula to estimate your Hemoglobin A1C percentage based on your average blood sugar readings. While daily finger-prick tests or Continuous Glucose Monitors (CGM) provide snapshots, the A1C provides a "big picture" of your blood sugar management over the last 2 to 3 months.

The Formula

The standard formula used by medical professionals to convert Average Glucose (mg/dL) to A1C is:

A1C = (Average Glucose + 46.7) / 28.7

A1C Reference Chart

Avg. Glucose (mg/dL) Avg. Glucose (mmol/L) Estimated A1C
126 mg/dL 7.0 mmol/L 6.0%
154 mg/dL 8.6 mmol/L 7.0%
183 mg/dL 10.2 mmol/L 8.0%

Important Considerations

  • Medical Grade: This calculator provides an estimate. It is not a replacement for a laboratory A1C test performed by a healthcare provider.
  • Variability: Factors like anemia, kidney disease, or pregnancy can affect the accuracy of A1C readings.
  • Timeframe: Ensure the glucose average you enter reflects at least 14-30 days of consistent data for a meaningful estimate.
function calculateA1C() { var glucoseInput = document.getElementById('glucoseInput').value; var unit = document.getElementById('glucoseUnit').value; var resultArea = document.getElementById('resultArea'); var a1cDisplay = document.getElementById('a1cResult'); var statusDisp = document.getElementById('statusIndicator'); if (glucoseInput === "" || glucoseInput <= 0) { alert("Please enter a valid average glucose reading."); return; } var avgMgdl = parseFloat(glucoseInput); // If unit is mmol/L, convert to mg/dL first // Conversion factor: 1 mmol/L = 18.0182 mg/dL if (unit === "mmoll") { avgMgdl = avgMgdl * 18.0182; } // Formula: A1C = (AG + 46.7) / 28.7 var a1cValue = (avgMgdl + 46.7) / 28.7; var roundedA1C = a1cValue.toFixed(1); // Display Results resultArea.style.display = "block"; a1cDisplay.innerHTML = roundedA1C + "%"; // Style the status indicator based on result if (a1cValue = 5.7 && a1cValue <= 6.4) { statusDisp.innerHTML = "PREDIABETES"; statusDisp.style.backgroundColor = "#fff3cd"; statusDisp.style.color = "#856404"; } else { statusDisp.innerHTML = "DIABETIC RANGE"; statusDisp.style.backgroundColor = "#f8d7da"; statusDisp.style.color = "#721c24"; } }

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