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: ''This article describes US Customary units. For instructions on how to convert between US Customary and metric units, see [[English and Metric Units]].''

: ''This article describes US Customary units. For instructions on how to convert between US Customary and metric units, see [[English and Metric Units]].''

The '''United States Customary System of Units''' (or more commonly within the [[United States]] - '''standard units'''), or, in the [[United Kingdom]], '''Imperial units''' are units of measurement. It is one of two primary systems of measurement. The other, the [[metric system]], enjoys widespread use outside of the United States. Only two countries have not officially adopted the metric system - [[Liberia]] and [[Burma]].<ref>{{cite web|url=http://lamar.colostate.edu/~hillger/faq.html#who-not|title=FAQ: Frequently Asked Questions about the metric system|format=HTML|language=English|work=U.S. Metric Association|accessdate=2007-09-03}}</ref>

The '''United States Customary System of Units''' (or more commonly within the [[United States]] - '''standard units'''), or, in the [[United Kingdom]], '''Imperial units''' are units of measurement. It is one of two primary systems of measurement. The other, the [[metric system]], enjoys widespread use outside of the United States. Only two countries have not officially adopted the metric system - [[Liberia]] and [[Burma]].<ref>{{cite web|url=http://lamar.colostate.edu/~hillger/faq.html#who-not|title=FAQ: Frequently Asked Questions about the metric system|language=English|work=U.S. Metric Association|accessdate=2007-09-03}}</ref>

As a matter of law, all US Customary units are defined in terms of their [[Metric system|metric]] counterparts.

As a matter of law, all US Customary units are defined in terms of their [[Metric system|metric]] counterparts.

=== Stone ===

=== Stone ===

The stone, a unit of 8 lb, is very commonly used in the UK as a measure of weight, especially of people and animals. It is common, for example, for a British person to express his or her weight as ''9 stone 8 pounds'' (written 9st 4lb), meaning 130 lb or approximately 59kg.

The stone, a unit of 8&nbsp;lb, is very commonly used in the UK as a measure of weight, especially of people and animals. It is common, for example, for a British person to express his or her weight as ''9 stone 8 pounds'' (written 9st 4&nbsp;lb), meaning 130&nbsp;lb or approximately 59&nbsp;kg.

=== Hundredweight ===

=== Hundredweight ===

Originally the English system defined the ''hundredweight'' (abbreviated cwt) as one hundred pounds. This is slightly heavier than an ancient [[talent]]. In the UK, 1 hundredweight (cwt) is now defined as 8 stone, i.e. 112 lb; the hundredweight is still quite widely used as a measure of weight in the UK.

Originally the English system defined the ''hundredweight'' (abbreviated cwt) as one hundred pounds. This is slightly heavier than an ancient [[talent]]. In the UK, 1 hundredweight (cwt) is now defined as 8 stone, i.e. 112&nbsp;lb; the hundredweight is still quite widely used as a measure of weight in the UK.

=== Ton ===

=== Ton ===

One US (or "short") ton is 2,000 pounds. An Imperial ("long") ton is 20 hundredweight or 160 stone or 2,240 pounds. The latter is being replaced by the ''metric ton'' (tonne) of 1,000 kg, or about 2,207 pounds.

One US (or "short") ton is 2,000 pounds. An Imperial ("long") ton is 20 hundredweight or 160 stone or 2,240 pounds. The latter is being replaced by the ''metric ton'' (tonne) of 1,000&nbsp;kg, or about 2,207 pounds.

== Mass ==

== Mass ==