HbA1c & Glycemic Markers
Enter your HbA1c to see your estimated average glucose, where you fall on the glycemic spectrum, and what your trend reveals about metabolic health.
Your glycemic markers
Enter your HbA1c from your most recent lab work. Optionally add your fasting glucose for a more complete picture.
HbA1c reflects your average blood glucose over the past 2-3 months. Fasting glucose is a single-point snapshot.
What this means
What to consider
Medications that may affect your result
Metformin lowers blood glucose and will reduce HbA1c over time. Your unmedicated HbA1c would likely be higher.
Insulin (all forms) directly reduces blood glucose and HbA1c. Results reflect the medicated state.
SGLT2 inhibitors (empagliflozin, dapagliflozin) lower blood glucose by increasing urinary glucose excretion, reducing HbA1c independently of insulin.
Corticosteroids (prednisone, dexamethasone) raise blood glucose and can elevate HbA1c, especially with prolonged use.
If you are taking glucose-lowering medications, your results reflect the medicated state. Discuss trends and targets with your healthcare provider.
About this tool
Formulas
Estimated Average Glucose: eAG (mg/dL) = 28.7 × A1C − 46.7. Based on the ADAG study (Nathan et al., 2008).
eAG (mmol/L) = eAG (mg/dL) / 18.018.
Classification Thresholds
Optimal: below 5.0%. Healthy range: 5.0-5.6%. Elevated (prediabetes range): 5.7-6.4%. Concerning (diabetes range): 6.5% and above. These thresholds follow ADA guidelines.
Known Limitations
HbA1c measures glycated hemoglobin and reflects a 2-3 month average. It does not capture daily glucose variability or post-meal spikes. HbA1c can be affected by hemoglobin variants (sickle cell trait, thalassemia), iron deficiency anemia, recent blood loss or transfusion, and chronic kidney disease. A single HbA1c is a snapshot of a trend; two or more readings over time are more informative.
Sources
Nathan DM, et al. "Translating the A1C assay into estimated average glucose values." Diabetes Care, 2008. American Diabetes Association. "Standards of Medical Care in Diabetes." Diabetes Care, 2024.
Educational tool only. Not for diagnostic purposes. Consult a healthcare provider for medical decisions.