HbA1c Calculator

Convert between HbA1c and estimated Average Plasma Glucose

HbA1c to Glucose

HbA1c (%)

%

Estimated Average Glucose:

--

mg/dL (switch to mmol/L)

Glucose to HbA1c

Average Glucose

mg/dL

Estimated HbA1c:

--

%

HbA1c Conversion Chart

HbA1c (%)	Average Glucose (mg/dL)	Average Glucose (mmol/L)	Condition

About HbA1c

Formula used:
eAG (mg/dL) = 28.7 × HbA1c - 46.7
eAG (mmol/L) = (28.7 × HbA1c - 46.7) / 18
HbA1c = (eAG + 46.7) / 28.7

This calculator is based on the ADA (American Diabetes Association) formula. Results should be used for educational purposes only.

HbA1c Calculator

What is this tool?

The HbA1c Calculator is a web-based tool designed to convert between HbA1c percentages (a measure of long-term blood glucose control) and average blood glucose levels. It provides:

Two-way conversion:

HbA1c to Estimated Average Glucose (eAG)

Average Glucose to HbA1c

Unit conversion: Switch between mg/dL (common in the U.S.) and mmol/L (common internationally).

Health status classification: Color-coded results indicating normal, prediabetes, or diabetes ranges.

Conversion chart: Reference table for common HbA1c and glucose values.

This tool follows guidelines from the American Diabetes Association (ADA) and is ideal for patients, caregivers, or healthcare professionals to quickly interpret diabetes management data.

How to Use the Tool

1. HbA1c to Glucose Conversion

Step 1: Enter an HbA1c value (e.g., 6.5%) in the left panel.

Step 2: Click "Calculate" to see the estimated average glucose in mg/dL or mmol/L.

Step 3: Toggle units using the "switch to mmol/L" link below the result.

2. Glucose to HbA1c Conversion

Step 1: Enter an average glucose value (e.g., 140 mg/dL or 7.8 mmol/L) in the right panel.

Step 2: Click "Calculate" to see the estimated HbA1c percentage.

Step 3: Switch units using the toggle link to match your input (default: mg/dL).

3. Using the Conversion Chart

The chart displays HbA1c values (4–14%) alongside corresponding glucose levels in both units.

Color coding:

Green: Normal (HbA1c < 5.7%)

Yellow: Prediabetes (HbA1c 5.7–6.4%)

Red: Diabetes (HbA1c ≥ 6.5%)

Key Features

1. Bidirectional Conversion:

Convert HbA1c to glucose and vice versa.

2, Dynamic Unit Switching:

Instantly toggle between mg/dL and mmol/L.

3. Condition Classification:

Results are color-coded to indicate health status.

4. Interactive Chart:

Precomputed values for quick reference.

ADA-Compliant Formulas:

HbA1c to eAG:

mg/dL = (28.7 × HbA1c) − 46.7

mmol/L = (mg/dL result) ÷ 18

eAG to HbA1c:

HbA1c = (eAG + 46.7) ÷ 28.7

Important Notes

Accuracy: Results align with ADA standards but may vary slightly from lab tests due to individual biological factors.

Purpose: For educational use only—not a substitute for medical advice.

Input Limits:

HbA1c: 4–20% (typical clinical range).

Glucose: Values must be ≥20 mg/dL or ≥1.1 mmol/L.

Who Should Use This Tool?

Patients: Track HbA1c goals or interpret lab results.

Healthcare Providers: Educate patients during consultations.

Caregivers: Monitor loved ones’ diabetes management.

Fitness Enthusiasts: Understand blood sugar trends.

Why HbA1c Matters

HbA1c reflects average blood glucose over 2–3 months. The ADA recommends:

• Normal: <5.7%
• Prediabetes: 5.7–6.4%
• Diabetes: ≥6.5%

Regular HbA1c testing helps prevent complications like neuropathy, kidney disease, or vision problems.

Disclaimer

This tool provides estimates based on mathematical formulas. Always consult a healthcare professional for medical decisions. Results may vary depending on individual health conditions or laboratory methods.