Live · Blood Sugar Checker v1.0

Blood Sugar Checker Online Informational

Enter one blood sugar reading (fasting, before a meal or 2-hour after a meal) and see how it compares with commonly used ranges in the US, UK and internationally.

Guideline style for interpretation

Units mg/dL or mmol/L

Blood sugar value single reading

Invalid value — please check your input.

When was this measured?

Recent A1C (optional) %

Invalid A1C value — please check your input.

Age (optional) years

Invalid age — this checker is built for adults.

Extra context (optional) tick all that apply

I already have a diabetes diagnosis I use glucose-lowering medication (e.g. metformin, insulin) This reading is from a CGM sensor I have symptoms (thirst, peeing more, weight loss, blurred vision)

Your blood sugar interpretation No value yet

mg/dL

Enter a value, choose when it was measured and pick a guideline style to see how it fits.

⚠️

Please be patient! This test will load in a few moments.

Analysing weight, waist, labs and lifestyle factors…

Use the form on the left to enter a single blood sugar reading – for example a fasting lab result, a before-meal capillary test or a 2-hour post-meal value. This card will highlight whether the number usually falls in a usual, higher-risk / prediabetes or diabetes-range band, based on the guideline style you selected.

Typical diagnostic ranges this checker uses

For fasting values, many guidelines consider below 100 mg/dL (≈5.6 mmol/L) usual, 100–125 mg/dL (≈5.6–6.9 mmol/L) as a prediabetes range, and 126 mg/dL (≥7.0 mmol/L) or above – confirmed on repeat – in the diabetes range. For 2-hour post-meal / OGTT readings, below 140 mg/dL (≈7.8 mmol/L) is usually considered normal, 140–199 mg/dL a higher-risk band, and 200 mg/dL or more in the diabetes range.

How to use this result safely

A single number is only one piece of information. Persistent readings in the prediabetes or diabetes-range bands, especially together with symptoms or a raised A1C, should be discussed with your doctor. They can confirm results with repeat tests, look at your full history and help you plan the next steps.

This checker is a risk estimate only and does not replace professional medical care or emergency services.

Continue learning about blood sugar & prediabetes

Normal glucose & A1C ranges What is prediabetes? Prediabetes symptoms How to lower risk naturally

Understanding Blood Sugar Ranges

Context is key: your blood sugar levels are dynamic and are directly influenced by the timing of your last meal, physical activity, and the measurement units used by your local laboratory.

Fasting vs. Post-Meal Readings

A "Fasting" reading is typically taken after at least 8 hours without food (usually in the morning). A "Post-meal" (postprandial) reading is ideally taken 2 hours after the start of a meal. Your body's ability to return glucose to normal levels after eating is a primary indicator of metabolic health.

Why Units Matter: mg/dL vs. mmol/L

Different countries use different measurement systems. The US, Germany, and France use mg/dL (milligrams per deciliter), while the UK, Canada, and Australia use mmol/L (millimoles per liter). Our checker handles both to provide accurate interpretations regardless of your location.

Is a Single High Reading a Diagnosis?

No. Blood sugar can be temporarily elevated due to stress, acute illness, poor sleep, or a particularly high-carb meal. A formal diagnosis of prediabetes or type 2 diabetes usually requires at least two separate tests showing elevated levels under clinical conditions.

When to Discuss Results with a Professional

If your results consistently fall into the "Prediabetes" or "Diabetes" ranges according to this tool, or if you experience symptoms like excessive thirst, blurred vision, or frequent urination, you should contact your healthcare provider for a formal A1C or Fasting Plasma Glucose test.