I can't figure out how to do what I want.

First of all, I want weight for my products to be in Kg. I suspect this is very easy, but can't find the option.

Secondly, I want shipping costs to be auto calculated based on total weight of items AND destination.

Destination should be 3 Groups which would be UK (Store is UK based!), Europe and Rest of World.

Is this easily achieved and if so, how

Thanks in advance

bugster