| 821 km * | 0.6213711922 mi | = 510.145748827 mi | 
| 1 km | 
| Fyzikálna jednotka | Dĺžky | 
|---|---|
| Nanometer | 8.21e+14 nm | 
| Mikrometer | 8.21e+11 µm | 
| Milimeter | 821000000.0 mm | 
| Centimeter | 82100000.0 cm | 
| Palec | 32322834.6457 in | 
| Stopa | 2693569.55381 ft | 
| Yard | 897856.517935 yd | 
| Meter | 821000.0 m | 
| Kilometer | 821.0 km | 
| Míľa | 510.145748827 mi | 
| Námorná míľa | 443.304535637 nmi | 
