| 680 mm * | 0.1 cm | = 68.0 cm | 
| 1 mm | 
| Units of measurement | Unit of length | 
|---|---|
| Nanometre | 680000000.0 nm | 
| Micrometre | 680000.0 µm | 
| Millimetre | 680.0 mm | 
| Centimetre | 68.0 cm | 
| Inch | 26.7716535433 in | 
| Foot | 2.2309711286 ft | 
| Yard | 0.7436570429 yd | 
| Metre | 0.68 m | 
| Kilometre | 0.00068 km | 
| Mile | 0.0004225324 mi | 
| Nautical mile | 0.0003671706 nmi | 
