| 21 ft * | 30.48 cm | = 640.08 cm |
| 1 ft |
| Jednostka miary | Długość |
|---|---|
| Nanometr | 6400800000.0 nm |
| Mikrometr | 6400800.0 µm |
| Milimetr | 6400.8 mm |
| Centymetr | 640.08 cm |
| Cal | 252.0 in |
| Stopa | 21.0 ft |
| Jard | 7.0 yd |
| Metr | 6.4008 m |
| Kilometr | 0.0064008 km |
| Mila | 0.0039772727 mi |
| Mila morska | 0.0034561555 nmi |
