| 646 mm * | 0.0393700787 in | = 25.4330708661 in | 
| 1 mm | 
| Mjerna jedinica | Duljine | 
|---|---|
| Nanometar | 646000000.0 nm | 
| mikrometar | 646000.0 µm | 
| Milimetar | 646.0 mm | 
| Centimetar | 64.6 cm | 
| Palac | 25.4330708661 in | 
| Stopa | 2.1194225722 ft | 
| Jard | 0.7064741907 yd | 
| Metar | 0.646 m | 
| Kilometar | 0.000646 km | 
| Milja | 0.0004014058 mi | 
| Nautička milja | 0.0003488121 nmi | 
