| 521 mm * | 0.0393700787 in | = 20.5118110236 in | 
| 1 mm | 
| Ölçü birimleri | Uzunluk birimleri | 
|---|---|
| Nanometre | 521000000.0 nm | 
| Mikrometre | 521000.0 µm | 
| Milimetre | 521.0 mm | 
| Santimetre | 52.1 cm | 
| İnç | 20.5118110236 in | 
| Fit | 1.7093175853 ft | 
| Yarda | 0.5697725284 yd | 
| Metre | 0.521 m | 
| Kilometre | 0.000521 km | 
| Mil | 0.0003237344 mi | 
| Deniz mili | 0.0002813175 nmi | 
