| 638 mm * | 0.1 cm | = 63.8 cm | 
| 1 mm | 
| Satuan | Panjang | 
|---|---|
| Nanometer | 638000000.0 nm | 
| Mikrometer | 638000.0 µm | 
| Milimeter | 638.0 mm | 
| Sentimeter | 63.8 cm | 
| Inci | 25.1181102362 in | 
| Kaki | 2.093175853 ft | 
| Yard | 0.6977252843 yd | 
| Meter | 0.638 m | 
| Kilometer | 0.000638 km | 
| mil | 0.0003964348 mi | 
| Mil laut | 0.0003444924 nmi | 
