People from outside the US may find this app convenient for converting US blood glucose values which are given in mg/dl into values generated by their blood glucose meters, which are generated in mmol/L.

Both sets of units are used to measure blood sugar levels and both give a measurement of the concentration of glucose in the blood, albeit in slightly different ways.

mmol/L gives the molarity, which is the number of molecules of a substance within a specified volume, in this case within 1 litre. mg/dL gives the concentration by the ratio of weight to volume, in this case milligrams per decilitre.

mmol/L is the most common measurement used in the UK with mg/dL predominantly used in the USA and continental Europe.

mmol/LInternational standard unit for measuring the concentration of glucose in the blood - also known as millimolar (mM). This unit is used in the UK.: Millimoles per litre
mg/dLUnit for measuring concentration of glucose in the blood in the USA - milligrams per decilitre.: Milligrams per 100 millilitres

Blood glucose typically varies from 4 mmol/L to 6 mmol/L for people without diabetes.

Blood sugar (also called blood glucose) needs to be tightly controlled in the human body to minimise the risk of complications developing.