kilometer meter and centimeter are units used to measure what
The millimeter (mm), centimeter (cm), decimeter (dm), meter (m), and kilometer (km) are metric units of length. These units are used when measuring length, height, width, depth, or distance. Key Facts 1 m = 1000mm 1 m = 100 cm 1 m = 10 dm 1 km = 1000 m.