Speed

Kilometres per hour (American English: kilometers per hour) is a unit of both speed (scalar) and velocity (vector). The unit symbol is km/h or km·h−1. The incorrect abbreviations "kph" and "kmph" are sometimes also seen in English-speaking countries, in analogy to mph. 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). Read more >>

I want to convert:

Metric

Kilometre per second
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Metre per second
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Kilometre per hour
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Millimetre per second
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Micrometre per second
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British/American

Mile per second
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Mile per hour
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Foot per second
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Nautical

Knot
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Other

Speed of light
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Speed of sound
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A brisk walk
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Speed of a common snail
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Speed (symbol: v) is the rate of motion, or equivalently the rate of change of position, expressed as distance d moved per unit of time t. Speed is a scalar quantity with dimensions distance/time; the equivalent vector quantity to speed is known as velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity. Read more >>