Blood Sugar Level Interpreter
Enter your blood sugar result to understand what it means. Covers fasting, random and post-meal glucose plus HbA1c, based on World Health Organization and American Diabetes Association diagnostic criteria.
Reference Ranges (mmol/L)
| Category | Fasting | 2h Post-Meal | HbA1c |
|---|---|---|---|
| Normal | < 5.6 | < 7.8 | < 5.7% |
| Prediabetes | 5.6–6.9 | 7.8–11.0 | 5.7–6.4% |
| Diabetes | ≥ 7.0 | ≥ 11.1 | ≥ 6.5% |
What is blood sugar and why does it matter?
Blood sugar, or blood glucose, is the main sugar found in your blood and your body's primary source of energy. It comes from the food you eat, and the hormone insulin helps move it from your bloodstream into your cells. When this system works well, blood sugar stays within a healthy range. When it does not — because the body cannot make enough insulin or cannot use it properly — blood sugar rises, which over time can lead to prediabetes and diabetes.
The different blood sugar tests
There are several ways to measure blood sugar, and each tells a slightly different story. A fasting test, taken after at least eight hours without food, shows your baseline level. A post-meal test, taken two hours after eating, shows how well your body handles glucose from food. A random test can be taken at any time. HbA1c is different — it reflects your average blood sugar over the past two to three months, giving a longer-term picture rather than a single snapshot. This tool interprets all four.
Understanding your result
For a fasting test, a result below 5.6 mmol/L (100 mg/dL) is normal, 5.6 to 6.9 mmol/L indicates prediabetes, and 7.0 mmol/L or higher suggests diabetes. For HbA1c, below 5.7% is normal, 5.7 to 6.4% is prediabetes, and 6.5% or above suggests diabetes. A single high reading does not confirm a diagnosis — doctors usually repeat tests to be sure. If your result is outside the normal range, this is a prompt to see a healthcare provider, not a cause for panic.
What you can do about high blood sugar
If your result suggests prediabetes, the good news is that it can often be reversed. Losing a modest amount of weight, becoming more physically active, reducing sugary drinks and refined carbohydrates, and increasing fibre intake can all bring blood sugar back toward normal and significantly cut your risk of developing diabetes. If your result is in the diabetic range, lifestyle changes remain important, and your doctor can advise whether medication is needed. Early action makes a real difference to long-term health.
Frequently Asked Questions
For a fasting test, a normal blood sugar is below 5.6 mmol/L (100 mg/dL). Two hours after eating, below 7.8 mmol/L (140 mg/dL) is normal. For HbA1c, below 5.7% is considered normal. Levels above these ranges may indicate prediabetes or diabetes and should be discussed with a doctor.
Sources & References
- 1.World Health Organization. Classification of diabetes mellitus and diagnostic criteria.
- 2.American Diabetes Association. Standards of Care in Diabetes — Diagnosis and Classification.
- 3.NHS. Blood sugar levels and testing.
LifeCheckIQ content is based on peer-reviewed research, recognised clinical guidelines, and authoritative medical sources. Our editorial team reviews all health content for accuracy.
Medical Disclaimer: This tool is for informational and educational purposes only. Results are not a medical diagnosis. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In an emergency, call your local emergency number or visit the nearest hospital immediately.