| 521 m * | 3.280839895 ft | = 1709.3175853 ft | 
| 1 m | 
| Unidad de medida | Longitudes | 
|---|---|
| Nanómetro | 5.21e+11 nm | 
| Micrómetro | 521000000.0 µm | 
| Milímetro | 521000.0 mm | 
| Centímetro | 52100.0 cm | 
| Pulgada | 20511.8110236 in | 
| Pie | 1709.3175853 ft | 
| Yarda | 569.772528434 yd | 
| Metro | 521.0 m | 
| Kilómetro | 0.521 km | 
| Milla | 0.3237343912 mi | 
| Milla náutica | 0.2813174946 nmi | 
