The metre is the metric unit for distance. You can also use fractions like cm, or multiples like km.
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The 'meter' is the metric unit of any length or distance, no matter what direction.
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The metric unit for distance/length is the metre, but what kind of formula are you asking for?
The metric unit for distance is the metre which is roughly 39.4 inches.
The metre (meter in the USA) is the base unit of length in the metric system. It is equal to the distance light travels in a vacuum in a time interval of 1/299792458 of a second.
The official system of measurements is the SI; it has SEVEN base units.
The SI unit for length is the meter, but for longer distances the kilometer is used. There are 1000 meters in a kilometer.