Blood Sugar Converter — mg/dL and mmol/L

Convert your blood sugar value between mg/dL and mmol/L and instantly classify it as Normal, Prediabetes, or Diabetes.

Blood sugar value (mg/dL)

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Reference Ranges

Fasting Blood Sugar

Normal

No elevated risk.

< 100 mg/dL

< 5.6 mmol/L

Prediabetes

Elevated risk. Lifestyle changes recommended.

100 – 125 mg/dL

5.6 – 6.9 mmol/L

Diabetes

Diabetes range. Consult a doctor.

≥ 126 mg/dL

≥ 7.0 mmol/L

Postprandial Blood Sugar (2h after meal)

Normal

< 140 mg/dL

< 7.8 mmol/L

Prediabetes

140 – 199 mg/dL

7.8 – 11.0 mmol/L

Diabetes

≥ 200 mg/dL

≥ 11.1 mmol/L

Values can vary depending on measurement time, time of day, and diet. Not a substitute for medical advice.

Blood Sugar Converter — mg/dL to mmol/L Guide →

Convert blood sugar between mg/dL and mmol/L. Understand fasting and postprandial reference ranges. Normal, Prediabetes, Diabetes explained with free calculator.