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Length and distance

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Conversion between units index
Length and distance diagram
calc
This calc uses simple factors to convert between a large number of different length units. Note that most archaic units are not exactly defined.
Distance

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notes
As a reference, the distance between atoms in a molecule is ~0.15 nm, the thickness of a human hair is ~30 microns, a double-decker bus is 8.4 m long, and the Empire State Building is 449 m high.