Centimeters to Kilometers Converter

About the cm to km calculation

One centimeter is exactly 0.00001 kilometers, so converting between them is a single multiplication. Enter any value above and the result updates as you type. How height and clothing sizes are quoted almost everywhere outside the US. The standard road-distance unit in most of the world.

Formula

km = cm × 0.00001

1 cm = 0.00001 km
1 km = 100,000 cm

Worked example

To convert 180 cm, multiply by 0.00001: 180 × 0.00001 = 0.0018 km.

Frequently asked questions

How many kilometers are in a centimeter?

There are 0.00001 kilometers in one centimeter. To convert any amount, multiply the number of centimeters by 0.00001.

How do I convert kilometers back to centimeters?

Divide instead of multiplying, or equivalently multiply by 100,000. One kilometer is 100,000 centimeters.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between centimeters 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?

Centimeters: how height and clothing sizes are quoted almost everywhere outside the US. 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