| 31.1 km * | 0.6213711922 mi | = 19.3246440786 mi | 
| 1 km | 
| Natuurkundige eenheid | Lengte | 
|---|---|
| Nanometer | 3.11e+13 nm | 
| Micrometer | 31100000000.0 µm | 
| Millimeter | 31100000.0 mm | 
| Centimeter | 3110000.0 cm | 
| Inch | 1224409.44882 in | 
| Voet | 102034.120735 ft | 
| Yard | 34011.3735783 yd | 
| Meter | 31100.0 m | 
| Kilometer | 31.1 km | 
| Mijl | 19.3246440786 mi | 
| Zeemijl | 16.7926565875 nmi | 
