| 638 cm * | 0.3937007874 in | = 251.181102362 in | 
| 1 cm | 
| Merska enota | Enota dolžine | 
|---|---|
| Nanometer | 6380000000.0 nm | 
| Mikrometer | 6380000.0 µm | 
| Milimeter | 6380.0 mm | 
| Centimeter | 638.0 cm | 
| Palec | 251.181102362 in | 
| Čevelj | 20.9317585302 ft | 
| Jard | 6.9772528434 yd | 
| Meter | 6.38 m | 
| Kilometer | 0.00638 km | 
| Mile | 0.0039643482 mi | 
| navtične milje | 0.0034449244 nmi | 
