How Long is 1 Millimeter? Definition and Real-Life Examples

A millimeter (abbreviated as "mm") is a unit of length in the metric measurement system that is equal to one thousandth of a meter.

1 millimeter  = (1/1000) meter or 1 meter = 1000 millimeters

The millimeter is used to measure things that have small lengths

Things That Can Have a length of Approximately 1 Millimeter

• The thickness of about 10 sheets of copy paper since each paper has a thickness of 0.1 mm

• The thickness of a finish nail used in construction

• The thickness of the lead of a pencil (shown above) 

• The thickness of a grain of rice

• The thickness of a sewing needle

• The thickness of about 20 hair strands if each hair strand measures 0.05 millimeters.