Conversion To SI Units
The exact conversion of the furlong to SI units varies slightly among English-speaking countries. In Canada and the United Kingdom, which define the furlong in terms the international yard of exactly 0.9144 metre, a furlong is 201.168 m. Australia does not formally define the furlong, but does define the chain and link in terms of the international yard. In the United States, which defines the furlong, chain, rod, and link in terms of the U.S. survey foot of exactly 1200⁄3937 metre, a furlong is approximately 201.1684 m; the US does not formally define a "survey yard". The difference of approximately 2 parts per million between the US value and the "international" value is insignificant for most practical measurements.
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