No, there is no deadline. They will do it when all the old people who have grown up with the antiquated system, have died. ;D
The US officially defined most measurements (inch, foot, etc.) in terms of metric units in 1893, and President Jimmy Carter pushed to move the US fully onto the metric system in the 1970's, but there has been public resistance to abandoning the traditional units, in spite of their more cumbersome relationships. The popularity of two-liter bottles of soft drinks are a rare success story in the introduction of metric units to the U.S.
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The US Metric Conversion Act calls for a coordinated national policy to encourage the use of the metric system in the United States. This is intended to facilitate compatibility with the global economy and promote efficiency in commerce and science.
In the United States, the decision to adopt the metric system was made by the federal government with the passage of the Metric Conversion Act in 1975. This act declared the metric system as the preferred system of weights and measures for United States trade and commerce.
The US does not use the metric system.
The Metric Conversion Act of 1975 was the legislation that made the metric system legal in the United States. The act aimed to encourage the voluntary adoption of the metric system in business and everyday life.
In the US metric system, a kilometer is equivalent to 0.6214 miles.