Which other countries, besides the U.S., do not use the metric system?
Many years ago USMA took a survey to determine which countries have officially adopted the metric system. According to that survey, the only other countries besides the U.S. that have not officially adopted the metric system are Liberia (in western Africa) and Burma (also known as Myanmar, in Southeast Asia). These two countries did not have an official policy of converting to metric at the time of the survey. Despite recent repeated inquiries to the governments of both countries, no official response from either country has been received as to whether a metric policy has been adopted since this survey was conducted. However, even in these countries, SI is used to some extent. The Web sites of these countries utilize both inch-pound and metric units. Visitors to these countries report some evidence of the use of the metric system.
Most other countries have either used the metric system for many years, or have adopted the metric system within the last 30 or 40 years. (The story of the metric transition in several countries is given in detail farther down on this page.) Nearly every country in the world has taken steps to replace traditional measurements. And, use of the metric system in the U.S. is ever increasing as well, especially linked with the wider acceptance of global standards and global trade which are mostly in metric measurements. Just as English has become the global language of commerce, the metric system has become the global language of measurement. Thus the phrase heard more and more:
"Speak in English, and Measure in Metric."
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The following chart shows when various countries adopted the metric system and is based on a survey conducted by USMA many years ago. The chart shows the countries' names at the time; some have since changed names. And, because metrication is an evolutionary process that takes place over time, any attempt to assign a single year to a country's conversion is only an approximation. Outside of what is shown on the chart, below, most other details of that survey have been lost. However, since the original development of the chart, the information on Jamaica has been added.
The main points to be garnered from the chart are: 1) only a few smaller countries, including some un-listed Caribbean countries heavily influenced by the U.S., have not formally adopted the use of SI, and 2) among countries not claiming to be metric, the U.S. is the only significant holdout.
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Metrication in the British Commonwealth
In the 1970s, most British Commonwealth nations changed from the Imperial system of units to the metric system. Several of these nations rapidly and successfully made the metric transition, thanks to strong government encouragement and support.