| 680 mm * | 0.1 cm | = 68.0 cm | 
| 1 mm | 
| Natuurkundige eenheid | Lengte | 
|---|---|
| Nanometer | 680000000.0 nm | 
| Micrometer | 680000.0 µm | 
| Millimeter | 680.0 mm | 
| Centimeter | 68.0 cm | 
| Inch | 26.7716535433 in | 
| Voet | 2.2309711286 ft | 
| Yard | 0.7436570429 yd | 
| Meter | 0.68 m | 
| Kilometer | 0.00068 km | 
| Mijl | 0.0004225324 mi | 
| Zeemijl | 0.0003671706 nmi | 
