| 5.1 cm * | 0.3937007874 in | = 2.0078740157 in | 
| 1 cm | 
| Units of measurement | Length | 
|---|---|
| Nanometre | 51000000.0 nm | 
| Micrometre | 51000.0 µm | 
| Millimetre | 51.0 mm | 
| Centimetre | 5.1 cm | 
| Inch | 2.0078740157 in | 
| Foot | 0.1673228346 ft | 
| Yard | 0.0557742782 yd | 
| Metre | 0.051 m | 
| Kilometre | 5.1e-05 km | 
| Mile | 3.16899e-05 mi | 
| Nautical mile | 2.75378e-05 nmi | 
