What unit is used to measure length in the metric system?

Answer 1

Length, as with any measurement of distance in the metric system, is measured in metres (m) 1 metre is approximately 3.3 feet in length. From an engineering perspective millimetres (1/1000th of a metre) are more commonly used to avoid having to quote lengths to 2 decimal places.
The basic unit of length is the meter.

Answer 2

It depends on the size of the object that you are trying to measure.

kilometres for distances between towns;

metres for short walks, houses or rooms;

centimetres for peoples' height, clothes measurements;

millimetres for minibeasts

micrometres for precision engineering;

nanometres for microscopic objects.