HbA1c to Glucose Calculator (eAG)
Converts Glycated Hemoglobin (HbA1c %) into Estimated Average Glucose (eAG) in mg/dL and mmol/L, with two-way CGM glucose-to-A1c prediction and IFCC international unit conversion.
HbA1c & Estimated Glucose Calculator
Meets the general ADA therapeutic target for most non-pregnant adults with diabetes. Prevents microvascular retinopathy, nephropathy, and neuropathy.
American Diabetes Association (ADA) Diagnostic & Target Thresholds
| HbA1c (%) | IFCC (mmol/mol) | Estimated Glucose (eAG) | Clinical Glycemic Status |
|---|---|---|---|
| < 5.7% | < 39 mmol/mol | < 117 mg/dL (6.5 mmol/L) | Normal Non-Diabetic Range |
| 5.7% – 6.4% | 39 – 47 mmol/mol | 117 – 137 mg/dL (6.5–7.6 mmol/L) | Pre-Diabetes (Impaired Fasting Glucose) |
| 6.5% – 7.0% | 48 – 53 mmol/mol | 140 – 154 mg/dL (7.8–8.6 mmol/L) | Diabetes Target (Well-Controlled Adult) |
| 7.1% – 8.0% | 54 – 64 mmol/mol | 157 – 183 mg/dL (8.7–10.2 mmol/L) | Moderate Elevation (Therapy Adjustment Warranted) |
| 8.1% – 9.0% | 65 – 75 mmol/mol | 186 – 212 mg/dL (10.3–11.8 mmol/L) | Suboptimal Glycemic Exposure |
| > 9.0% | > 75 mmol/mol | > 212 mg/dL (> 11.8 mmol/L) | Poor Control (High Microvascular Risk) |
Clinical Formula: The ADAG Mathematical Equation
The landmark A1c-Derived Average Glucose (ADAG) study, conducted jointly by the American Diabetes Association (ADA), European Association for the Study of Diabetes (EASD), and International Diabetes Federation (IDF), examined over 2,700 continuous glucose monitoring (CGM) readings to establish the linear mathematical relationship between HbA1c and mean blood glucose.
Companion Metabolic & Renal Tools
HbA1c reflects average glycemic exposure over the approximately 120-day lifespan of red blood cells (weighted heavily toward the preceding 30 days). Conditions that alter erythrocyte turnover (hemolytic anemia, hemoglobinopathies, recent transfusion, or Stage 5 CKD) can yield spuriously low or high A1c values.