| 821 mm * | 0.1 cm | = 82.1 cm | 
| 1 mm | 
| Unidad de medida | Longitudes | 
|---|---|
| Nanómetro | 821000000.0 nm | 
| Micrómetro | 821000.0 µm | 
| Milímetro | 821.0 mm | 
| Centímetro | 82.1 cm | 
| Pulgada | 32.3228346457 in | 
| Pie | 2.6935695538 ft | 
| Yarda | 0.8978565179 yd | 
| Metro | 0.821 m | 
| Kilómetro | 0.000821 km | 
| Milla | 0.0005101457 mi | 
| Milla náutica | 0.0004433045 nmi | 
