| 684 mm * | 0.1 cm | = 68.4 cm | 
| 1 mm | 
| Natuurkundige eenheid | Lengte-eenheid | 
|---|---|
| Nanometer | 684000000.0 nm | 
| Micrometer | 684000.0 µm | 
| Millimeter | 684.0 mm | 
| Centimeter | 68.4 cm | 
| Inch | 26.9291338583 in | 
| Voet | 2.2440944882 ft | 
| Yard | 0.7480314961 yd | 
| Meter | 0.684 m | 
| Kilometer | 0.000684 km | 
| Mijl | 0.0004250179 mi | 
| Zeemijl | 0.0003693305 nmi | 
