HbA1c to Estimated Average Glucose (eAG) Calculator for 6.5% HbA1c (mmol/L)
Diagnostic threshold for diabetes, displayed in mmol/L for users in countries using SI units.
Converts Hemoglobin A1c (HbA1c) percentage to Estimated Average Glucose (eAG) using the ADAG study formula. Enter your HbA1c (%), Unit Divisor (1 for mg/dL, 18 for mmol/L) to get an instant estimated average glucose (eag). Formula: (28.7 * hba1c - 46.7) / unit_divisor.
Estimated Average Glucose (eAG)
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How It Works
How It Works
This calculator converts your Hemoglobin A1c (HbA1c) percentage into an Estimated Average Glucose (eAG) value. HbA1c reflects your average blood sugar levels over the past 2–3 months. The calculation uses a formula from the ADAG study to estimate what your daily average glucose level has been.
- First, multiply HbA1c (%) by 28.7
- Then subtract 46.7 to get glucose in mg/dL
- Divide the result by 1 for mg/dL output
- Divide the result by 18 for mmol/L output
- Final formula: (28.7 × HbA1c − 46.7) ÷ unit divisor
Understanding the Results
The result shows your estimated average blood glucose based on your HbA1c level. This helps translate your long-term A1c result into the same units you see on a glucose meter, making it easier to understand in daily terms.
- Higher HbA1c values lead to higher estimated average glucose
- If you entered 1 as the divisor, the result is in mg/dL
- If you entered 18 as the divisor, the result is in mmol/L
- The value represents an average over the past 2–3 months
- Use this number to better relate A1c results to daily glucose readings
Frequently Asked Questions
What does this HbA1c to eAG calculator do?
This calculator converts your Hemoglobin A1c (HbA1c) percentage into an Estimated Average Glucose (eAG) value. It uses the ADAG study formula to estimate your average blood glucose over the past 2–3 months. The result can be displayed in either mg/dL or mmol/L depending on the unit divisor you enter.
When should I use this calculator?
You can use this calculator after receiving your HbA1c test result from a laboratory. It is helpful if you want to understand your long-term glucose control in the same units used by your glucose meter. This makes it easier to compare daily readings with your A1c result.
How do I choose the correct unit divisor?
Enter 1 if you want the result in mg/dL, which is commonly used in the United States. Enter 18 if you want the result in mmol/L, which is commonly used in many other countries. The calculator automatically adjusts the formula by dividing the mg/dL result by the number you provide.
What formula is used to calculate eAG?
The calculator uses the ADAG study formula: eAG (mg/dL) = 28.7 × HbA1c − 46.7. If mmol/L is desired, the mg/dL result is divided by 18. This provides a standardized and widely accepted estimation of average glucose levels.
Can this calculator replace daily blood glucose monitoring?
No, this calculator does not replace daily glucose monitoring. HbA1c reflects an average over several months and does not show daily fluctuations or hypoglycemic events. Always follow your healthcare provider’s recommendations for glucose testing and diabetes management.
Why does my eAG not exactly match my meter average?
The eAG value is a statistical estimate based on population data from the ADAG study. Individual differences in red blood cell lifespan, medical conditions, or meter variability can cause slight differences. It should be used as a general comparison tool rather than an exact match to your glucose meter average.
Disclaimer
This health calculator is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Disclaimer.