guest wrote:Cholesterol level in France is given in gr/litre. In Britain the unit used is mmol/litre. How to convert one into the other?
You need the molar mass. For cholesterol, it is 386.654 g/mol (use same value for total, HDL, LDL). Note this molar mass, in general, is different for each substance and is equal to the molecular weight.
So to convert 2 g/L (US 200 mg/dL)
2 g/L x 1 mol/386.654 g = 0.00517 mol/L = 5.17 mmol/L