Unit Definition
A long ton is defined as exactly 2,240 pounds.
A pound is defined as exactly 453.59237 grams.
A long ton then is exactly 1,016,046.9088 grams, which is approximately 1,016 kg – conveniently close to a metric tonne.
The long ton arises from the traditional British measurement system: A long ton is 20 hundredweight, each of which is 8 stone, which is defined as 14 pounds. Thus a long ton is 20 × 8 × 14 lb = 2240 lb.
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