The result of your conversion between Lb, Lbs and ton [Short, US] appears here
To convert between Lb, Lbs and Ton [Short, US] you have to do the following:
First divide 0.45359237 / 0.45359237*2000 = 0.0005
Then multiply the amount of Lb, Lbs you want to convert to Ton [Short, US], use the chart below to guide you.
Symbol: lb, lbm
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Symbol: ST
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