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A foot (plural: feet, abbreviation: ft, symbol:(′) the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have ..more definition+
The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space ..more definition+
In relation to the base unit of [length] => (meters), 1 Feet (ft) is equal to 0.3048 meters, while 1 Light Seconds (ls) = 299800000 meters.| 21 Feet | to common length units |
|---|---|
| 21 ft | = 6.4008 meters (m) |
| 21 ft | = 0.0064008 kilometers (km) |
| 21 ft | = 640.08 centimeters (cm) |
| 21 ft | = 21 feet (ft) |
| 21 ft | = 252 inches (in) |
| 21 ft | = 7 yards (yd) |
| 21 ft | = 0.0039772727272727 miles (mi) |
| 21 ft | = 6.7654581968079E-16 light years (ly) |
| 21 ft | = 24192.003047811 pixels (PX) |
| 21 ft | = 4.0005E+35 planck length (pl) |