| 669 cm * | 0.032808399 ft | = 21.9488188976 ft | 
| 1 cm | 
| Natuurkundige eenheid | Lengte | 
|---|---|
| Nanometer | 6690000000.0 nm | 
| Micrometer | 6690000.0 µm | 
| Millimeter | 6690.0 mm | 
| Centimeter | 669.0 cm | 
| Inch | 263.385826772 in | 
| Voet | 21.9488188976 ft | 
| Yard | 7.3162729659 yd | 
| Meter | 6.69 m | 
| Kilometer | 0.00669 km | 
| Mijl | 0.0041569733 mi | 
| Zeemijl | 0.003612311 nmi | 
