| 678 ft * | 30.48 cm | = 20665.44 cm | 
| 1 ft | 
| Natuurkundige eenheid | Lengte | 
|---|---|
| Nanometer | 2.066544e+11 nm | 
| Micrometer | 206654400.0 µm | 
| Millimeter | 206654.4 mm | 
| Centimeter | 20665.44 cm | 
| Inch | 8136.0 in | 
| Voet | 678.0 ft | 
| Yard | 226.0 yd | 
| Meter | 206.6544 m | 
| Kilometer | 0.2066544 km | 
| Mijl | 0.1284090909 mi | 
| Zeemijl | 0.1115844492 nmi | 
