Blood Glucose Unit Converter
Enter a blood glucose value and select its unit to convert between mg/dL and mmol/L.
How blood glucose units convert
Blood glucose is measured in milligrams per deciliter (mg/dL) in some countries, including the United States, and in millimoles per liter (mmol/L) in most of the rest of the world. The conversion factor between them is 18.0182, reflecting glucose's molecular weight.
To convert mg/dL to mmol/L, divide by 18.0182. To convert mmol/L to mg/dL, multiply by 18.0182. This calculator performs the conversion automatically in whichever direction you need.
Frequently asked questions
Why do different countries use different units for blood glucose?
mg/dL measures mass concentration, commonly used in the US and a few other countries, while mmol/L measures molar concentration (the international SI standard used in most of the world, including the UK, Canada, and Australia).
Where does the 18.0182 conversion factor come from?
It's glucose's molecular weight (180.182 g/mol) divided by 10, which accounts for converting between deciliters and liters alongside the molar-to-mass unit conversion.
Is this calculator meant for medical diagnosis or dosing decisions?
No — this is a unit conversion tool only. Always consult a healthcare professional for interpreting blood glucose readings or making any medical decisions.