| 688 mm * | 0.0393700787 in | = 27.0866141732 in | 
| 1 mm | 
| Fyzikálna jednotka | Dĺžka | 
|---|---|
| Nanometer | 688000000.0 nm | 
| Mikrometer | 688000.0 µm | 
| Milimeter | 688.0 mm | 
| Centimeter | 68.8 cm | 
| Palec | 27.0866141732 in | 
| Stopa | 2.2572178478 ft | 
| Yard | 0.7524059493 yd | 
| Meter | 0.688 m | 
| Kilometer | 0.000688 km | 
| Míľa | 0.0004275034 mi | 
| Námorná míľa | 0.0003714903 nmi | 
