| 42.1 mm * | 0.1 cm | = 4.21 cm | 
| 1 mm | 
| Måleenhed | Længder | 
|---|---|
| Nanometer | 42100000.0 nm | 
| Mikrometer | 42100.0 µm | 
| Nillimeter | 42.1 mm | 
| Centimeter | 4.21 cm | 
| Tomme | 1.657480315 in | 
| Fod | 0.1381233596 ft | 
| Yard | 0.0460411199 yd | 
| Meter | 0.0421 m | 
| Kilometer | 4.21e-05 km | 
| Nil | 2.61597e-05 mi | 
| Sømil | 2.27322e-05 nmi | 
