| 521 mm * | 0.0393700787 in | = 20.5118110236 in | 
| 1 mm | 
| Fyzikálna jednotka | Dĺžka | 
|---|---|
| Nanometer | 521000000.0 nm | 
| Mikrometer | 521000.0 µm | 
| Milimeter | 521.0 mm | 
| Centimeter | 52.1 cm | 
| Palec | 20.5118110236 in | 
| Stopa | 1.7093175853 ft | 
| Yard | 0.5697725284 yd | 
| Meter | 0.521 m | 
| Kilometer | 0.000521 km | 
| Míľa | 0.0003237344 mi | 
| Námorná míľa | 0.0002813175 nmi | 
