Blood glucose values from 20 to 600 mg/dL

Pick your reading. Each page explains it fasting and after meals, for people with and without diabetes, with the mmol/L equivalent and what to do next. Readings in mmol/L? Use the checker — it converts for you.

Small numbers like 6 or 11 are usually mmol/L — those pages show both readings.

Very low 20–53 mg/dL · Level 2 hypoglycemia — treat immediately.

Low 54–69 mg/dL · Level 1 hypoglycemia (with diabetes) / below normal.

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69

Normal fasting 70–99 mg/dL · Normal fasting glucose without diabetes.

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Prediabetes range (fasting) 100–125 mg/dL · Fasting prediabetes range; normal after a meal.

Elevated 126–199 mg/dL · Diabetes range when fasting; prediabetes range 2 h after a meal.

High 200–299 mg/dL · Diabetes range at any time; with diabetes above target.

Very high 300–600 mg/dL · Check ketones; get medical advice.

Possibly mmol/L 2–19 · pages explain both readings

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