The short ton (S/T) is a unit of mass equal to 2,000 lb (exactly 907.18474 kg). In the United States it is often called simply ton without distinguishing it from the metric ton (or tonne, 1,000 kilograms) or the long ton (2,240 pounds, exactly 1,016.0469088 kg) —rather, the other two are specifically noted. There are, however, some U.S. applications for which unspecified tons normally means long tons (for example, Navy ships) or metric tons (world grain production figures). A short ton–force is 2,000 pounds-force (8,896 newtons).