| 251 mm * | 0.0393700787 in | = 9.8818897638 in | 
| 1 mm | 
| Fyzikálna jednotka | Jednotka dĺžky | 
|---|---|
| Nanometer | 251000000.0 nm | 
| Mikrometer | 251000.0 µm | 
| Milimeter | 251.0 mm | 
| Centimeter | 25.1 cm | 
| Palec | 9.8818897638 in | 
| Stopa | 0.8234908136 ft | 
| Yard | 0.2744969379 yd | 
| Meter | 0.251 m | 
| Kilometer | 0.000251 km | 
| Míľa | 0.0001559642 mi | 
| Námorná míľa | 0.0001355292 nmi | 
