Originally Posted by
oxenos
In fact, 20 hundredweight = 2240 lb = 1 ton.
Tonne is, I think, used to mean 1000 kg = 2200 lb. i.e a metric ton(ne) (actually 2204.5 lb.)
Then there is the short ton, or US ton, which is 2000lb.
Simple really.
Damn, it was consciously in my mind to write 'ton' not 'tonne' so I went ahead and did the wrong thing. You are, of course, quite right.