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A metric ton is a unit of measurement based on the metric system, rather than the standard, or imperial, system more commonly used in the United States. It is known as a tonne in most other countries, and is equivalent to 1,000 kilograms. Strictly speaking, it is a megagram, being one million grams.
In America, a ton, also called a short ton, is equal to 2,000 U.S. pounds (abbreviated lbs.). Most other industrialized nations have standardized around the metric system and use what is called the metric ton. A metric ton is equal to 1,000 kilograms (abbreviated kg).