If you are referring to mass then it is the same in the US as it is anywhere else.
If currency then rates vary see the related link.
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There are 2000 pounds/ton; so 4000 pounds equals 2 tons (US).
Divide by 2,000: 15,000 pounds equals 7.5 tons. (US)
1 ton is 2,240 pounds (UK), in the US it's 2,000. So that would be 2,240 (UK)/2,000 (US) pounds of dirt.
Divide pounds by 2,000: 60,000 pounds is 30 US tons.
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