| 491 mm * | 0.0393700787 in | = 19.3307086614 in | 
| 1 mm | 
| Fyzikálna jednotka | Jednotka dĺžky | 
|---|---|
| Nanometer | 491000000.0 nm | 
| Mikrometer | 491000.0 µm | 
| Milimeter | 491.0 mm | 
| Centimeter | 49.1 cm | 
| Palec | 19.3307086614 in | 
| Stopa | 1.6108923885 ft | 
| Yard | 0.5369641295 yd | 
| Meter | 0.491 m | 
| Kilometer | 0.000491 km | 
| Míľa | 0.0003050933 mi | 
| Námorná míľa | 0.0002651188 nmi | 
