| 640 cm * | 0.032808399 ft | = 20.9973753281 ft | 
| 1 cm | 
| Unità | Tulijiet | 
|---|---|
| Nanometru | 6400000000.0 nm | 
| Mikrometru | 6400000.0 µm | 
| Millimetru | 6400.0 mm | 
| ċentimetru | 640.0 cm | 
| Pulzier | 251.968503937 in | 
| Piedi | 20.9973753281 ft | 
| Yard | 6.9991251094 yd | 
| Metru | 6.4 m | 
| Kilometru | 0.0064 km | 
| Mil | 0.0039767756 mi | 
| Mil nawtiku | 0.0034557235 nmi | 
