Kilometre per hour

Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The correct SI symbol is km/h or km·h−1, although the unit is sometimes written colloquially as kph, kmph, or km/hr. None of these corruptions is correct under the rules of SI in reference to correct style when using symbols. It is often spoken and sometimes written as klicks or kays in slang usage.

Related Topics:
Kilometre - Hour - American spelling - Unit - Speed - Scalar - Velocity - Vector - Slang

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By definition, an object travelling at a speed of 1 km/h for an hour would move 1 kilometre.

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• 3.6 km/h ≡ 1 m·s⁻¹, the SI derived unit of speed, metre per second
• 1 km/h ≈ 0.27778 m/s
• 1 km/h ≈ 0.62137 mph ≈ 0.91134 foot per second
 
Kilometre per hour: Examples of speeds in km/h ►