| 646 cm * | 0.032808399 ft | = 21.1942257218 ft | 
| 1 cm | 
| Matavimo vienetas | Ilgis | 
|---|---|
| Nanometras | 6460000000.0 nm | 
| Mikrometras | 6460000.0 µm | 
| Milimetras | 6460.0 mm | 
| Centimetras | 646.0 cm | 
| Colis | 254.330708662 in | 
| Pėda | 21.1942257218 ft | 
| Yard | 7.0647419073 yd | 
| Metras | 6.46 m | 
| Kilometras | 0.00646 km | 
| Mylia | 0.0040140579 mi | 
| Jūrmylė | 0.003488121 nmi | 
