| 251 mm * | 0.1 cm | = 25.1 cm | 
| 1 mm | 
| Måleenhed | Længde | 
|---|---|
| Nanometer | 251000000.0 nm | 
| Mikrometer | 251000.0 µm | 
| Nillimeter | 251.0 mm | 
| Centimeter | 25.1 cm | 
| Tomme | 9.8818897638 in | 
| Fod | 0.8234908136 ft | 
| Yard | 0.2744969379 yd | 
| Meter | 0.251 m | 
| Kilometer | 0.000251 km | 
| Nil | 0.0001559642 mi | 
| Sømil | 0.0001355292 nmi | 
