| 668 cm * | 0.032808399 ft | = 21.9160104987 ft | 
| 1 cm | 
| Eenhede van meting | Lengte | 
|---|---|
| Nanometer | 6680000000.0 nm | 
| Mikrometer | 6680000.0 µm | 
| Millimeter | 6680.0 mm | 
| Sentimeter | 668.0 cm | 
| Duim | 262.992125984 in | 
| Voet | 21.9160104987 ft | 
| Jaart | 7.3053368329 yd | 
| Meter | 6.68 m | 
| Kilometer | 0.00668 km | 
| Myl | 0.0041507596 mi | 
| Seemyl | 0.0036069114 nmi | 
