Definition:Metric System/Length/Kilometre

Kilometre

The kilometre is a metric unit of length.

 $\ds$  $\ds 1$ kilometre $\ds$ $=$ $\ds 1000$ metres $\ds$ $=$ $\ds 100 \, 000$ centimetres $\ds$ $=$ $\ds 10^6$ millimetres $\ds$ $=$ $\ds 39 \, 370 \cdotp 4$ inches $\ds$ $=$ $\ds 0.621$ miles

Symbol

The symbol for the kilometre is $\mathrm {km}$:

$\mathrm k$ for kilo
$\mathrm m$ for metre.

Linguistic Note

It is commonplace to pronounce the word kilometre with the stress on the second syllable: kil-o-me-ter.

However, the pronunciation kil-o-me-ter is also heard.