That varies, between one airline and another - or, within the same airline, between one year and another.
72,000 kilos
500lbs is 226.8 kilos.
95 kilos is 209.44 lbs
75 kilos is 11.8 stone.
In 1 tonne, there are 1000 kilos. Therefore, if you have 5000 kilos, it is the same as 5 tonnes.