| 688 cm * | 0.01 m | = 6.88 m | 
| 1 cm | 
| Units of measurement | Lengths | 
|---|---|
| Nanometre | 6880000000.0 nm | 
| Micrometre | 6880000.0 µm | 
| Millimetre | 6880.0 mm | 
| Centimetre | 688.0 cm | 
| Inch | 270.866141732 in | 
| Foot | 22.5721784777 ft | 
| Yard | 7.5240594926 yd | 
| Metre | 6.88 m | 
| Kilometre | 0.00688 km | 
| Mile | 0.0042750338 mi | 
| Nautical mile | 0.0037149028 nmi | 
