| 20.9 in * | 0.0254 m | = 0.53086 m | 
| 1 in | 
| Natuurkundige eenheid | Lengte-eenheid | 
|---|---|
| Nanometer | 530860000.0 nm | 
| Micrometer | 530860.0 µm | 
| Millimeter | 530.86 mm | 
| Centimeter | 53.086 cm | 
| Inch | 20.9 in | 
| Voet | 1.7416666667 ft | 
| Yard | 0.5805555556 yd | 
| Meter | 0.53086 m | 
| Kilometer | 0.00053086 km | 
| Mijl | 0.0003298611 mi | 
| Zeemijl | 0.0002866415 nmi | 
