| 638 cm * | 0.3937007874 in | = 251.181102362 in | 
| 1 cm | 
| Matavimo vienetas | Ilgis | 
|---|---|
| Nanometras | 6380000000.0 nm | 
| Mikrometras | 6380000.0 µm | 
| Milimetras | 6380.0 mm | 
| Centimetras | 638.0 cm | 
| Colis | 251.181102362 in | 
| Pėda | 20.9317585302 ft | 
| Yard | 6.9772528434 yd | 
| Metras | 6.38 m | 
| Kilometras | 0.00638 km | 
| Mylia | 0.0039643482 mi | 
| Jūrmylė | 0.0034449244 nmi | 
