| 644 cm * | 0.032808399 ft | = 21.1286089239 ft | 
| 1 cm | 
| Mõõtühik | Pikkus | 
|---|---|
| nanomeeter | 6440000000.0 nm | 
| Mikromeeter | 6440000.0 µm | 
| Millimeeter | 6440.0 mm | 
| Sentimeeter | 644.0 cm | 
| Toll | 253.543307087 in | 
| Jalg | 21.1286089239 ft | 
| Õu | 7.0428696413 yd | 
| Meeter | 6.44 m | 
| Kilomeeter | 0.00644 km | 
| Miil | 0.0040016305 mi | 
| Meremiil | 0.0034773218 nmi | 
