Metric System
10 millimeters (mm) 1 centimeter (cm)
10 centimeters 1 decimeter (dc)
10 decimeters 1 meter (m)
10 meters 1 dekameter (dam)
10 dekameters 1 hectometer (hm)
10 hectometres 1 kilometer (km)
U.S. System
12 inches (in) 1 foot (ft)
3 feet 1 yard (yd)
5 1/2 yards 1 rod (rd), pole, or perch (16 1/2 ft)
40 rods 1 furlong (fur) = 220 yds = 660 ft
8 furlongs 1 mile (mi) = 1,760 yards
3 miles 1 league