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1 Activate Your Free Trial!  Ton. Ton, unit of weight in the avoirdupois system equal to 2,000 pounds (907.18 kg) in the United States (the short ton) and 2,240 pounds (1,016.05 kg) in Britain (the long ton). The metric ton used in most other countries is 1,000 kg, equivalent to 2,204.6 pounds avoirdupois.
In the United Kingdom, the use of the international pound was implemented in the Weights and Measures Act 1963. An avoirdupois pound is equal to 16 avoirdupois ounces and to exactly 7,000 grains. The short ton is a unit of mass equal to 2000 lb (exactly 907.18474 kg).In the United States it is often called simply ton without distinguishing it from the metric ton (or tonne) and the long ton rather, the other two are specifically noted.ou can view more details on each measurement unit: lb or tons. The SI base unit for mass is the kilogram. 1 kilogram is equal to 2.20462262185 lb, or 0.00110231131092 tons.