| 644 cm * | 0.3937007874 in | = 253.543307087 in | 
| 1 cm | 
| Jednostka miary | Jednostka długości | 
|---|---|
| Nanometr | 6440000000.0 nm | 
| Mikrometr | 6440000.0 µm | 
| Milimetr | 6440.0 mm | 
| Centymetr | 644.0 cm | 
| Cal | 253.543307087 in | 
| Stopa | 21.1286089239 ft | 
| Jard | 7.0428696413 yd | 
| Metr | 6.44 m | 
| Kilometr | 0.00644 km | 
| Mila | 0.0040016305 mi | 
| Mila morska | 0.0034773218 nmi | 
