Estimated Average Glucose Calculator
Convert HbA1c to estimated average glucose levels over the past 3 months
Calculate Estimated Average Glucose
Diabetes Status
Normal range: <5.7% (non-diabetic), <7% (diabetic target)
Result Units
Estimated Average Glucose Results
Calculation Details:
HbA1c: 0.0%
Formula: eAG (mg/dL) = (28.7 × HbA1c%) - 46.7
eAG (mg/dL): 0.0
eAG (mmol/L): 0.0
*Represents average glucose over the past 2-3 months
HbA1c Reference Values
Non-diabetic
- • Normal: <5.7%
- • Prediabetes: 5.7-6.4%
- • Diabetes: ≥6.5%
Diabetic Targets
- • General adults: <7%
- • Pregnant women: <6%
- • Elderly/comorbid: <8%
Quick Reference
| HbA1c (%) | eAG (mg/dL) | eAG (mmol/L) |
|---|---|---|
| 5.0 | 97 | 5.4 |
| 6.0 | 126 | 7.0 |
| 7.0 | 154 | 8.6 |
| 8.0 | 183 | 10.2 |
| 9.0 | 212 | 11.8 |
Understanding Estimated Average Glucose
What is HbA1c?
HbA1c (glycated hemoglobin) is a blood test that measures your average blood glucose levels over the past 2-3 months. When glucose in the blood bonds with hemoglobin in red blood cells, it forms HbA1c. Since red blood cells live for about 120 days, this test provides a long-term picture of blood sugar control.
Why Use eAG?
- •Easier to understand than HbA1c percentage
- •Correlates with daily glucose meter readings
- •Helps patients relate to their glucose goals
- •Useful for diabetes management discussions
Formula and Accuracy
Calculation Formula:
eAG (mg/dL) = (28.7 × HbA1c%) - 46.7
To convert to mmol/L: divide mg/dL by 18
Important Notes:
- • eAG has a margin of error (±27 mg/dL or ±1.5 mmol/L)
- • Individual glucose readings may vary significantly
- • Based on studies of people without hemoglobin variants
- • May not be accurate for all ethnicities
⚠️ Medical Disclaimer
This calculator is for educational and informational purposes only. It should not replace professional medical advice, diagnosis, or treatment. The estimated average glucose calculation provides an approximation based on HbA1c levels, but individual glucose readings may vary significantly from this estimate. Always consult with your healthcare provider for proper interpretation of your diabetes management and blood glucose monitoring. If you have concerns about your blood sugar levels, seek medical attention.