Who is this especially useful for?
- ✓Anyone with diabetes monitoring HbA1c
- ✓People with prediabetes tracking progression
- ✓Those using continuous glucose monitors wanting to compare with A1c
- ✓Healthcare providers explaining glucose targets to patients
- ✓Anyone wanting to understand what their A1c really means in daily terms
eAG bridges the gap between abstract lab percentages and the glucose numbers you see every day.
What is eAG?
Estimated Average Glucose (eAG) converts your HbA1c percentage into an estimated average blood glucose level. The formula, derived from the landmark ADAG (A1c-Derived Average Glucose) Study, provides a direct translation:
eAG (mg/dL) = 28.7 × HbA1c − 46.7
The ADAG study followed 507 participants for 3 months, comparing continuous glucose monitoring data with HbA1c levels. This established a reliable mathematical relationship allowing patients and clinicians to discuss glucose control in more intuitive terms.
Example Calculation
6.5%
HbA1c
28.7×6.5−46.7
Formula
140 mg/dL
An A1c of 6.5% corresponds to an average glucose of ~140 mg/dL — the diabetes diagnostic threshold.
Beyond Single Readings
Unlike a single fasting glucose reading, eAG represents the average of ALL glucose levels — including post-meal spikes, overnight dips, and daily variations. Someone with normal fasting glucose but high post-meal spikes will have elevated eAG, revealing issues that fasting tests miss.
See what your A1c means in everyday glucose terms.
Why eAG Matters
- Bridges Lab and Daily Values: eAG translates the abstract HbA1c percentage into glucose units you use daily, making it easier to connect lab values with home monitoring
- Reflects Long-Term Control: Because HbA1c reflects 2-3 months of glucose exposure, eAG represents your true average — not just fasting or snapshot values
- Enables Goal Setting: Knowing your eAG helps set meaningful glucose targets. If your goal is A1c below 7%, you know to aim for average glucose below 154 mg/dL
- Reveals Hidden Patterns: Someone with normal fasting glucose but high post-meal spikes will have elevated eAG, revealing issues that fasting tests miss
Three Perspectives on eAG
Different health paradigms interpret eAG thresholds differently:
eAG Interpretation by Paradigm
Standard Medical
Research Consensus
Metabolic Optimization
Standard Medical
ADA diagnostic criteria for diabetes and prediabetes.
< 117 mg/dL normal; 117-137 mg/dL prediabetes; > 140 mg/dL diabetes range.
Research Consensus
Epidemiological targets for prevention and optimal metabolic health.
Target below 100 mg/dL (A1c below 5.1%) for excellent metabolic function.
Metabolic Optimization
Expected values with carbohydrate restriction — lower A1c is typical.
< 90 mg/dL common with strict low-carb; > 100 mg/dL warrants investigation.
How to Test
💡 Pro tip: Our calculator instantly converts your HbA1c to eAG, so you can see what your A1c really means in everyday glucose terms.
How to Lower Your eAG/HbA1c
Dietary Strategies
Reduce refined carbohydrates
Major driver of glucose spikes
Increase fiber intake
Slows glucose absorption
Practice portion control
Especially with starches
Consider time-restricted eating
Meal timing can improve control
Lifestyle Modifications
Regular physical activity
Both aerobic and resistance
Achieve healthy body weight
Reduces insulin resistance
Prioritize quality sleep
7-9 hours for glucose regulation
Manage stress
Cortisol raises blood sugar
Monitoring & Medical
Check post-meal glucose
Identify problem foods
Consider CGM
Continuous monitoring for insights
Track trends over time
Not just single readings
Work with healthcare provider
Optimize medication if needed
When HbA1c May Be Unreliable
Conditions affecting red blood cells can alter HbA1c accuracy: anemia, recent blood transfusion, hemoglobin variants (common in certain ethnicities), kidney disease, and pregnancy. Iron deficiency can falsely raise A1c, while hemolysis can lower it. Fructosamine or glycated albumin may be better alternatives in these situations.
Frequently Asked Questions
Key Takeaways
- 1eAG = 28.7 × HbA1c − 46.7 (derived from ADAG Study with 507 participants)
- 2**Translates abstract A1c percentage** into everyday glucose units
- 3Reflects 2-3 months of glucose exposure — your true average
- 4Below 117 mg/dL normal (A1c below 5.7%); above 140 mg/dL diabetes range (A1c ≥6.5%)
- 5Reveals hidden patterns — normal fasting can mask elevated overall glucose
- 6HbA1c may be unreliable with anemia, hemoglobin variants, or kidney disease