# Kilometer per second conversions

The kilometer per second conversion selector on this page selects the speed/velocity measurement unit to convert to starting from kilometers per second (km/s). To make a conversion starting from a unit of speed other than kilometer per second, simply click on the "Reset" button.

## About kilometer per second

The **kilometer per second** is a unit of speed in the metric system of units equal to 1,000 meters per second (1 km/s = 1,000 m/s), the derived unit of speed in the International System of Units (SI).

The kilometer per second (km/s) is also equal to approximately 2,236.93629 miles per hour (mph), or 3,280.8399 feet per second (ft/s), or 39,370.0787 inches per second (in/s) or 1,943.8445 knots (kn).

The speed is the distance traveled by an object during a period of time. Thus, kilometers per second (or kilometers/second) show how many kilometers are traveled in one second. The kilometer is a unit of length in the metric system while the second is a unit of time.

Symbol: km/s

Plural: kilometers per second

aka: kilometre/second, kilometre per second (plural: kilometres per second, Int. spelling), kilometer/second (plural: kilometers/second, US spelling)