| 21 m * | 3.280839895 ft | = 68.8976377953 ft | 
| 1 m | 
| Måleenhet | Lengder | 
|---|---|
| Nanometer | 21000000000.0 nm | 
| Mikrometer | 21000000.0 µm | 
| Millimeter | 21000.0 mm | 
| Centimeter | 2100.0 cm | 
| Tomme | 826.771653543 in | 
| Fot | 68.8976377953 ft | 
| Yard | 22.9658792651 yd | 
| Meter | 21.0 m | 
| Kilometer | 0.021 km | 
| Engelsk mil | 0.013048795 mi | 
| Nautisk mil | 0.0113390929 nmi | 
