| 640 cm * | 0.3937007874 in | = 251.968503937 in | 
| 1 cm | 
| Måttenhet | Längdenhet | 
|---|---|
| Nanometer | 6400000000.0 nm | 
| Mikrometer | 6400000.0 µm | 
| Millimeter | 6400.0 mm | 
| Centimeter | 640.0 cm | 
| Inch | 251.968503937 in | 
| Fot | 20.9973753281 ft | 
| Yard | 6.9991251094 yd | 
| Meter | 6.4 m | 
| Kilometer | 0.0064 km | 
| Engelsk mil | 0.0039767756 mi | 
| Nautisk mil | 0.0034557235 nmi | 
