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- (For the South African airport with IATA code "KMH", see Johan Pienaar Airport.)

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.

The km/h is the worldwide 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 BIPM.

- 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
- 1 knot ≡ 1.852 km/h (exactly)
- 1 mile = 1.609344 km (~1.61 km)
- 1 mile per hour = ~1.61 kilometres per hour
- 1 kilometre per hour = ~0.62 miles per hour

- The converter Online conversions for speed units: km/h, mph, knots, etc.
- Online Conversions of Metric and Imperial Units
- Conversion Calculator for Units of Speed

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Last updated on Friday September 12, 2008 at 20:48:53 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Friday September 12, 2008 at 20:48:53 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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