| 644 cm * | 0.032808399 ft | = 21.1286089239 ft | 
| 1 cm | 
| Mjerna jedinica | Jedinica za duljinu | 
|---|---|
| Nanometar | 6440000000.0 nm | 
| mikrometar | 6440000.0 µm | 
| Milimetar | 6440.0 mm | 
| Centimetar | 644.0 cm | 
| Palac | 253.543307087 in | 
| Stopa | 21.1286089239 ft | 
| Jard | 7.0428696413 yd | 
| Metar | 6.44 m | 
| Kilometar | 0.00644 km | 
| Milja | 0.0040016305 mi | 
| Nautička milja | 0.0034773218 nmi | 
