| 664 cm * | 0.032808399 ft | = 21.7847769029 ft | 
| 1 cm | 
| Units of measurement | Unit of length | 
|---|---|
| Nanometre | 6640000000.0 nm | 
| Micrometre | 6640000.0 µm | 
| Millimetre | 6640.0 mm | 
| Centimetre | 664.0 cm | 
| Inch | 261.417322835 in | 
| Foot | 21.7847769029 ft | 
| Yard | 7.261592301 yd | 
| Metre | 6.64 m | 
| Kilometre | 0.00664 km | 
| Mile | 0.0041259047 mi | 
| Nautical mile | 0.0035853132 nmi | 
