| 640 mm * | 0.1 cm | = 64.0 cm | 
| 1 mm | 
| Fyzikálna jednotka | Jednotka dĺžky | 
|---|---|
| Nanometer | 640000000.0 nm | 
| Mikrometer | 640000.0 µm | 
| Milimeter | 640.0 mm | 
| Centimeter | 64.0 cm | 
| Palec | 25.1968503937 in | 
| Stopa | 2.0997375328 ft | 
| Yard | 0.6999125109 yd | 
| Meter | 0.64 m | 
| Kilometer | 0.00064 km | 
| Míľa | 0.0003976776 mi | 
| Námorná míľa | 0.0003455724 nmi | 
