| 660 mm * | 0.1 cm | = 66.0 cm | 
| 1 mm | 
| Units of measurement | Unit of length | 
|---|---|
| Nanometre | 660000000.0 nm | 
| Micrometre | 660000.0 µm | 
| Millimetre | 660.0 mm | 
| Centimetre | 66.0 cm | 
| Inch | 25.9842519685 in | 
| Foot | 2.1653543307 ft | 
| Yard | 0.7217847769 yd | 
| Metre | 0.66 m | 
| Kilometre | 0.00066 km | 
| Mile | 0.000410105 mi | 
| Nautical mile | 0.0003563715 nmi | 
