| 678 mm * | 0.0393700787 in | = 26.6929133858 in | 
| 1 mm | 
| Natuurkundige eenheid | Lengte | 
|---|---|
| Nanometer | 678000000.0 nm | 
| Micrometer | 678000.0 µm | 
| Millimeter | 678.0 mm | 
| Centimeter | 67.8 cm | 
| Inch | 26.6929133858 in | 
| Voet | 2.2244094488 ft | 
| Yard | 0.7414698163 yd | 
| Meter | 0.678 m | 
| Kilometer | 0.000678 km | 
| Mijl | 0.0004212897 mi | 
| Zeemijl | 0.0003660907 nmi | 
