I have weightwtchers scales that tell you all that. Apparently they pass a small electric charge (you don't feel it) through your body in order to measure body fat, water etc.
Funny- I asked my son just that about half an hour ago!! Can't afford any new gizmos- but at a guess I think I must still be nigh on 50% blubber.
No- can't be quite that bad as my bones must weigh something.
Anyone know how to work out how much your bones weigh ( he he!!)