Convert blood glucose levels between mg/dL (US standard) and mmol/L (International WHO standard) with clinical accuracy.
0.5549943946 Millimole per Liter
Blood sugar (glucose) concentration is a vital health metric for managing diabetes, hypoglycemia, and metabolic health. Two primary measurement systems exist globally: mg/dL (milligrams of glucose per deciliter of blood) and mmol/L (millimoles of glucose molecules per liter of blood).
The molecular formula for D-glucose is C₆H₁₂O₆, which has a molar mass of 180.1559 g/mol (180.1559 mg/mmol). Because 1 Liter = 10 Deciliters, 1 mmol/L equals 180.1559 mg / 10 dL = 18.0182 mg/dL. Multiplying by 18.0182 yields exact medical conversions.
Fasting Normal: 70–99 mg/dL (3.9–5.5 mmol/L); Fasting Prediabetes (Impaired Fasting Glucose): 100–125 mg/dL (5.6–6.9 mmol/L); Fasting Diabetes Diagnostic Threshold: ≥ 126 mg/dL (≥ 7.0 mmol/L); Post-Meal (2 hours after eating) Target: < 140 mg/dL (< 7.8 mmol/L).
To convert blood glucose from mg/dL to mmol/L, divide the mg/dL value by 18.0182 (or roughly 18). For example, 180 mg/dL ÷ 18.0182 = 9.99 mmol/L (~10.0 mmol/L).
To convert blood glucose from mmol/L to mg/dL, multiply the mmol/L value by 18.0182. For example, 7.0 mmol/L × 18.0182 = 126.13 mg/dL.
For non-diabetic adults, normal fasting blood glucose is generally 70 to 99 mg/dL (3.9 to 5.5 mmol/L). A fasting level of 100 to 125 mg/dL (5.6 to 6.9 mmol/L) indicates prediabetes, while 126 mg/dL (7.0 mmol/L) or higher on multiple tests indicates diabetes.
The US, Germany, France, Japan, and India traditionally use mass concentration (mg/dL), while the UK, Canada, Australia, and European health systems use molar concentration (mmol/L), as recommended by the International System of Units (SI).
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