Meters to Kilometers Converter

About the m to km calculation

One meter is exactly 0.001 kilometers, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The SI base unit of length, defined by the distance light travels in 1/299,792,458 of a second. The standard road-distance unit in most of the world.

Formula

km = m × 0.001

1 m = 0.001 km
1 km = 1,000 m

Worked example

To convert 100 m, multiply by 0.001: 100 × 0.001 = 0.1 km.

Frequently asked questions

How many kilometers are in a meter?

There are 0.001 kilometers in one meter. To convert any amount, multiply the number of meters by 0.001.

How do I convert kilometers back to meters?

Divide instead of multiplying, or equivalently multiply by 1,000. One kilometer is 1,000 meters.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between meters and kilometers is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Meters: the SI base unit of length, defined by the distance light travels in 1/299,792,458 of a second. Kilometers: the standard road-distance unit in most of the world.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units