| 639 cm * | 0.032808399 ft | = 20.9645669291 ft | 
| 1 cm | 
| Eenhede van meting | Lengte | 
|---|---|
| Nanometer | 6390000000.0 nm | 
| Mikrometer | 6390000.0 µm | 
| Millimeter | 6390.0 mm | 
| Sentimeter | 639.0 cm | 
| Duim | 251.57480315 in | 
| Voet | 20.9645669291 ft | 
| Jaart | 6.9881889764 yd | 
| Meter | 6.39 m | 
| Kilometer | 0.00639 km | 
| Myl | 0.0039705619 mi | 
| Seemyl | 0.003450324 nmi | 
