| 2.1 mm * | 0.0393700787 in | = 0.0826771654 in | 
| 1 mm | 
| Natuurkundige eenheid | Lengte | 
|---|---|
| Nanometer | 2100000.0 nm | 
| Micrometer | 2100.0 µm | 
| Millimeter | 2.1 mm | 
| Centimeter | 0.21 cm | 
| Inch | 0.0826771654 in | 
| Voet | 0.0068897638 ft | 
| Yard | 0.0022965879 yd | 
| Meter | 0.0021 m | 
| Kilometer | 2.1e-06 km | 
| Mijl | 1.3049e-06 mi | 
| Zeemijl | 1.1339e-06 nmi | 
