# Tonne

The

**tonne**() ( non-preferred SI derived unit; SI symbol:**t**), commonly referred to as the**metric ton**in the United States, is a non-SI metric unit of mass equal to 1,000 kilograms; Weights and Measures Act 1985. National Archives (London), 2014. Accessed 13 Aug 2014. Table 6 . BIPM. Retrieved on 2011-07-10. The International System of Units (SI) (PDF), 8th Edition, 2006, Section 4.1 or one**megagram**(Mg); it is equivalent to approximately pounds, or 0.984 long tons (imperial). Although not part of the SI*per se*, the tonne is " accepted for use with" SI units and prefixes by the International Committee for Weights and Measures, along with several other units like the bar, litre and day.https://www.nist.gov/pml/pubs/sp811/appenb8.cfm#T