| 511 mm * | 0.0393700787 in | = 20.1181102362 in | 
| 1 mm | 
| Units of measurement | Length | 
|---|---|
| Nanometre | 511000000.0 nm | 
| Micrometre | 511000.0 µm | 
| Millimetre | 511.0 mm | 
| Centimetre | 51.1 cm | 
| Inch | 20.1181102362 in | 
| Foot | 1.6765091864 ft | 
| Yard | 0.5588363955 yd | 
| Metre | 0.511 m | 
| Kilometre | 0.000511 km | 
| Mile | 0.0003175207 mi | 
| Nautical mile | 0.0002759179 nmi | 
