| 646 mm * | 0.1 cm | = 64.6 cm | 
| 1 mm | 
| Natuurkundige eenheid | Lengtes | 
|---|---|
| Nanometer | 646000000.0 nm | 
| Micrometer | 646000.0 µm | 
| Millimeter | 646.0 mm | 
| Centimeter | 64.6 cm | 
| Inch | 25.4330708661 in | 
| Voet | 2.1194225722 ft | 
| Yard | 0.7064741907 yd | 
| Meter | 0.646 m | 
| Kilometer | 0.000646 km | 
| Mijl | 0.0004014058 mi | 
| Zeemijl | 0.0003488121 nmi | 
