The basic metric unit is the metre.
meters
You can use any unit of length, such as meters or millimeters.
The ISO length unit to use would be the cementer.
Units of length, such as mm, are used for this.
I would expect it would be centremetres.
Meters are used as the unit for length in most countries, but some, such as the United States, use a different system of measurement.
It's SI unit is meters
always the meter to measure length. This is an SI (international) unit of measurment, and is the standard international unit of measurment for length.
If not use the standard unit, you won't get correct answers when calculating.
Kilometers are a unit of length, used to measure distance.
miles or kilomiters
The unit of length is metre(m), unit of volume is centimetre cube(c.c), unit of mass is kilogram(kg).