Kilometers to Feet

About Kilometers and Feet

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.

Feet (ft): An ancient unit found in virtually every culture, historically based on the human foot; defined as exactly 0.3048 meters by the 1959 International Yard and Pound Agreement. Common uses: Human height in the United States, building heights, room dimensions, aviation altitudes (universally, even in metric countries), and yards/football fields in American sports.

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 kilometer and foot.

The exact relationship is feet = kilometers × 3.28083990e+3, 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 kilometers and feet 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.