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When did the USA introduce the metric system as preferred for weights and measures?

never

1805

1866

1975

President Gerald Ford signed the Metric Conversion Act in1975. It declared the metric system "the preferred system of weights and measures for United States trade and commerce", but permitted the use of United States customary units in all activities. The metrification board was abolished in 1982 by President Ronald Reagan.

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Measures quiz Units quiz USA quiz

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Answers by country

Australia

40%

0%

0%

60%

10

Greece

36%

0%

9%

54%

11

Germany

45%

5%

9%

39%

74

Austria

25%

25%

9%

38%

31

Poland

54%

5%

11%

28%

1311

the United States

40%

20%

12%

26%

49

the United Kingdom

60%

2%

14%

22%

35

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