Seeing blood sugar numbers in a chart format makes them much easier to understand. Instead of remembering multiple ranges, a simple reference table helps quickly identify whether a reading is generally considered normal, elevated, or high.
This article provides an easy-to-read blood sugar levels chart for adults, based on commonly used medical reference ranges.
Why Use a Blood Sugar Chart?
Blood sugar levels vary depending on when the test is taken. A chart organizes fasting, after-meal, and random readings side by side so you can compare results more clearly.
Doctors and labs often rely on these same reference ranges when reviewing test reports. Having a chart available helps you follow discussions during medical visits.
General Blood Sugar Reference Chart
Fasting Blood Sugar (after 8 hours without food)
- Normal range: 70–99 mg/dL
- Elevated range: 100–125 mg/dL
- High range: 126 mg/dL or higher
After-Meal Blood Sugar (2 hours after eating)
- Normal range: Below 140 mg/dL
- Elevated range: 140–199 mg/dL
- High range: 200 mg/dL or higher
Random Blood Sugar (any time of day)
- Normal range: Below 140 mg/dL
- Elevated range: 140–199 mg/dL
- High range: 200 mg/dL or higher
These values are general educational references. Only qualified healthcare professionals can provide diagnosis or treatment guidance.
How to Use This Chart
If your reading falls in the elevated or high range, it does not automatically confirm a medical condition. Doctors usually recommend repeat testing or additional tests such as HbA1c to understand long-term glucose control.
Charts are best used as a reference tool, not as a diagnostic method.
Factors That Influence Blood Sugar Levels
Readings may vary due to:
- Recent meals
- Stress
- Physical activity
- Sleep patterns
- Illness
- Medications
Because of this, it’s always best to discuss repeated abnormal results with a healthcare professional.
When to Consult a Doctor
If your readings consistently fall outside normal reference ranges, or if you experience symptoms like frequent thirst or fatigue, consult a qualified medical professional for proper evaluation.
For an overview of blood sugar readings and general reference ranges, visit our Blood Sugar Levels Explained page.