| 821 cm * | 0.3937007874 in | = 323.228346457 in | 
| 1 cm | 
| Natuurkundige eenheid | Lengte-eenheid | 
|---|---|
| Nanometer | 8210000000.0 nm | 
| Micrometer | 8210000.0 µm | 
| Millimeter | 8210.0 mm | 
| Centimeter | 821.0 cm | 
| Inch | 323.228346457 in | 
| Voet | 26.9356955381 ft | 
| Yard | 8.9785651794 yd | 
| Meter | 8.21 m | 
| Kilometer | 0.00821 km | 
| Mijl | 0.0051014575 mi | 
| Zeemijl | 0.0044330454 nmi | 
