Centimeters to Kilometers

About Centimeters and Kilometers

Centimeters (cm): One hundredth of a meter; the metric system was formalized by the French Academy of Sciences in 1799 and the meter has been refined four times since, most recently in terms of the speed of light. Common uses: Body measurements, paper sizes, small everyday distances, and the universal unit for fabric and sewing-pattern dimensions outside the United States.

Kilometers (km): A thousand meters, where the meter is the SI base unit of length defined by the speed of light. Common uses: Road distances, race lengths, geographic and astronomical small distances, and country-to-country travel measurements outside the US.

How the conversion works

Length conversions use the SI definition: 1 inch is exactly 0.0254 meters and 1 mile is exactly 1,609.344 meters. The factor above is the exact ratio between centimeter and kilometer.

The exact relationship is kilometers = centimeters × 0.00001, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.

When this conversion matters

Converting between centimeters and kilometers comes up wherever length measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.