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Definition of a common term, For full article see Wikipedia:km/h

The kilometre per hour (American English: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The unit symbol is km/h or km·h−1; however, the colloquial abbreviations "kph" and "kmph" are sometimes also used in English-speaking countries, in analogy to mph, although these are not in accordance with international scientific standards. In North American slang and military usage, km/h (as well as km) is commonly pronounced, and sometimes even written, as klicks or kays (K's), although these may also be used to refer to kilometres.

Worldwide, the km/h is the most commonly used speed unit on road signs and car speedometers. Therefore, it is far more common in everyday usage than the proper SI unit of speed, m/s. Along with the kW·h, km/h is the most commonly used metric unit based on the hour, which is only a "non-SI unit accepted for use with the International System of Units" by the International Bureau of Weights and Measures (BIPM).[1]


  • 3.6 km/h ≡ 1 m/s, the SI derived unit of speed, metre per second
  • 1 km/h ≈ 0.277 78 m/s
  • 1 km/h ≈ 0.621 37 mph ≈ 0.911 34 feet per second
  • knot ≡ 1.852 km/h (exactly)
  • 1 mile = 1.609344 km (~1.61 km)[2]
  • 1 mile per hour = ~1.61 kilometres per hour
  • 1 kilometre per hour = ~0.62 miles per hour

See also


  1. BIPM brochure (SI reference)
  2. 1 yard ≡ 0.9144 m and
    1 mile = 1760 yards thus
    1 mile = 1760 × 0.9144 ÷ 1000 km

External links

Smallwikipedialogo.png This page uses some content from Wikipedia. The original article was at Km/h. The list of authors can be seen in the page history. As with Tractor & Construction Plant Wiki, the text of Wikipedia is available under the Creative Commons by Attribution License and/or GNU Free Documentation License. Please check page history for when the original article was copied to Wikia