The Liberal federal government of Pierre Trudeau first began implementing metrication in Canada in 1970 with a government agency dedicated to implementing the project, the Metric Commission, being established in 1971. By the mid-1970s, metric product labelling was introduced. In 1972, the provinces agreed to make all road signs metric by 1977. There was some resistance to metrication, especially as the sectors of the economy where the federal Weights and Measures Act required metric to be used grew in number. The metrication of gasoline and diesel fuel sales in 1981 prompted 37 Progressive Conservative Members of Parliament to open a "freedom to measure" gas station in Carleton Place, Ontario, selling gas in both imperial gallons and litres. The small city of Peterborough, Ontario, was a noted hotbed of opposition to metrication, having been one of the government's three test centres for the metrication process. Bill Domm, a Member of Parliament representing the riding of Peterborough, was one of the country's most outspoken opponents of metrication. During this period, a few government employees lost their jobs for their opposition to metrication.^[2] One official with Revenue Canada who publicly opposed mandatory metric conversion was dismissed for "conduct unacceptable for a public servant."

The election of the Progressive Conservative government of Brian Mulroney in 1984 slowed, and ultimately stalled, metrication in Canada. The Metric Commission was abolished on March 31, 1985, and many regulations requiring metric measurements have either been repealed or are no longer enforced. As a result, Canadians today typically use an often confusing mix of metric and Imperial measurements in their daily lives.

Training on metric conversion was not universal. Poor metrication training was a contributing factor to Air Canada Flight 143, the so called Gimli Glider, running out of fuel mid-flight on 23 July 1983.

Notwithstanding the end of officially-sanctioned metrication in Canada, most laws, regulations, and official forms exclusively use metric measurements. However, imperial measures still have legal definitions in Canada and can be used alongside of metric units.<sup>[1][3][4]

source: wikipedia</sup>