Meters in the UK show the result in mmol/L and in the US it is displayed in mg/dL so a reading of 5.0 will be 90. If this is what you mean you cant convert it using your old meter, you will need to get a new one. If that usnt an option all you have to do is divide the reading in your meter by 18.2 and it will give you the mmol reading. For example 95.4 mg ÷ 18.2 = 5.3 mmol