Length

A kilometre (US spelling: kilometer; symbol: km) is a unit of length that is equal to 1,000 metres, the current International System of Units (SI) base unit of length. The kilometre is part of the metric system. A corresponding unit of area is the square kilometre and a corresponding unit of volume is the cubic kilometre. Read more >>

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Metric

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British/American

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Nautical

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Astronomical

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In general English usage, length (symbols: l, L) is one particular instance of distance: an object's length is its extent along its longest dimension. This is to be contrasted with height, denoting vertical extent, and width (or breadth), denoting a lateral extent along a dimension shorter than an object's length. In the physical sciences and engineering, the word "length" is typically used synonymously with "distance". Read more >>