| 82.1 mm * | 0.1 cm | = 8.21 cm | 
| 1 mm | 
| Natuurkundige eenheid | Lengte-eenheid | 
|---|---|
| Nanometer | 82100000.0 nm | 
| Micrometer | 82100.0 µm | 
| Millimeter | 82.1 mm | 
| Centimeter | 8.21 cm | 
| Inch | 3.2322834646 in | 
| Voet | 0.2693569554 ft | 
| Yard | 0.0897856518 yd | 
| Meter | 0.0821 m | 
| Kilometer | 8.21e-05 km | 
| Mijl | 5.10146e-05 mi | 
| Zeemijl | 4.43305e-05 nmi | 
