Blood Sugar Calculator
Analyze your blood glucose levels and convert between mg/dL and mmol/L. Check fasting and post-meal ranges.
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Blood Sugar Reference Ranges
| Category | Fasting (mg/dL) | After Meal (mg/dL) |
|---|---|---|
| Normal | Less than 100 | Less than 140 |
| Prediabetes | 100 — 125 | 140 — 199 |
| Diabetes | 126 or higher | 200 or higher |
These values are based on American Diabetes Association guidelines. Always consult a healthcare provider for personal medical advice.
Understanding Blood Glucose
Blood glucose, or blood sugar, is the main sugar found in your blood. It comes from the food you eat and is your body's primary source of energy. Your blood sugar levels change throughout the day, rising after meals and returning to baseline during fasting periods.
Hemoglobin A1C is a blood test that measures your average blood sugar over the past 2-3 months. An A1C below 5.7% is normal, 5.7% to 6.4% indicates prediabetes, and 6.5% or higher indicates diabetes. The A1C test is often used alongside fasting glucose tests for diagnosis.
Diabetes Prevention involves maintaining a healthy weight, eating a balanced diet rich in fiber and low in refined sugars, exercising regularly, and avoiding tobacco. Even modest lifestyle changes can reduce the risk of developing type 2 diabetes by up to 58%.