| 21 km * | 0.6213711922 mi | = 13.048795037 mi |
| 1 km |
| Natuurkundige eenheid | Lengte |
|---|---|
| Nanometer | 2.1e+13 nm |
| Micrometer | 21000000000.0 µm |
| Millimeter | 21000000.0 mm |
| Centimeter | 2100000.0 cm |
| Inch | 826771.653543 in |
| Voet | 68897.6377953 ft |
| Yard | 22965.8792651 yd |
| Meter | 21000.0 m |
| Kilometer | 21.0 km |
| Mijl | 13.048795037 mi |
| Zeemijl | 11.3390928726 nmi |
