While these three countries continue to use the imperial system, both Liberia and Myanmar are gradually introducing metric units, which are already widely used in some contexts.

America’s refusal to adopt the metric system has not been for lack of trying, however. In 1975, Congress passed the Metric Conversion Act, which declared metric as the preferred system of the ...

Lincoln Chafee announced his bid for the White House on Wednesday with an unusual policy stance: He called for adoption of the metric system.

Walter Block argues that “ Canadians Hate the Metric System ” imposed on them in 1975 (op-ed, Sept. 16). In the same year, reacting to the Metric Conversion Act, Americans resisted metrics.

Learn how to convert between metric and imperial units. Convert cms to inches to feet and kilometres to miles in this GCSE maths revision guide.

Much to Mitchell’s surprise, her comment about the metric system—officially it’s known as the International System of Units (SI)—evoked a strong reaction.

While children starting school this week will learn the metric system, many Britons remain attached to imperial measures. Will the UK ever give them up?