km
kilometer
Lengthexact by definition
The kilometre is one thousand metres, an exact decimal prefix on the SI base unit. It is the standard unit of road distance and map scale in most countries. The factor is exact by definition.
Watch out: One kilometre is about 0.621 miles, so a speed limit of 100 km/h is roughly 62 mph. The reverse conversion, 1 mile = 1.609 km, is the one drivers most often need at a border.
| 1 km | 1,000 m |
Solvers that use length