View source for Kilometers per hour

'''Kilometers per hour''' is a unit of both speed (scalar) and velocity (vector). The symbol is '''km·h<sup>&minus;1</sup>''' or '''km/h''' but is often, though incorrectly, abbreviated to '''kph''' (see also [[mph]]). It is often spoken and sometimes written as klicks or kays (K's) in slang usage.

By definition, an object travelling at a speed of 1 km·h<sup>&minus;1</sup> in a straight line for an hour would move 1 kilometer.

Although much more common in everyday usage than m/s, it is not an SI unit (because the hour isn't).

==Conversions==
* 3.6&nbsp;km·h<sup>&minus;1</sup> ≡ 1&nbsp;m&middot;s<sup>&minus;1</sup>, the SI derived unit of speed, meter per second
* 1&nbsp;km·h<sup>&minus;1</sup> ≈ 0.277 78&nbsp;m&middot;s<sup>&minus;1</sup>
* 1&nbsp;km·h<sup>&minus;1</sup> ≈ 0.621 37&nbsp;[[Miles per hour|mph]] &asymp; 0.911 34&nbsp; feet per second
* 1&nbsp;knot ≡ 1.852&nbsp;km&middot;h<sup>&minus;1</sup> (exactly)

==See Also==
* [[Miles per hour]]
* [[Speed limit]]s

==External Links==
*[http://www.convert-me.com/en/convert/speed Conversion Calculator for Units of Speed]