At sea level, a kilogram weighs approximately:
bimjob and pwincess are right with 9.81 newtons or 2.2pounds. pounds and newtons are units of force which is what weight is. a kilogram is a unit of mass, not weight.
bimjob, force causes acceleration and if there were nothing holding the 1kg rock from falling, it would fall with an acceleration of appox 9.81 m/s/s.
Generally 1 kilogram weighs 2.2 pounds - BUT Kilogram is a unit of mass that is the same at sea level and out in space, where as a 2.2 POUND sea side rock weighs zero out in the void of space.
It's been a looong time since high school, but isn't a newton a measure of force or acceleration?
Forgive me if I'm wrong but a kilogram is a kilogram anywhere in earth's gravity.