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in the left column hold for both international and survey units.
: "?" means "is approximately equal to";
: "=" means "is exactly equal to".

One metre is exactly equivalent to  inches and to  yards.

A simple mnemonic to assist with conversion is "three 3s": 1 metre is nearly equivalent to 3 feet 3 3/8 inches. This gives an overestimate of 0.125 mm.

The ancient Egyptian cubit was

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