Light-second conversions

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The light-second conversion selector selects the length/distance measurement unit to convert to starting from light-seconds. To make a conversion starting from a unit of length other than light-second, simply click on the "Reset" button.

What is light-second?

The light-second (or light second) is a unit of distance defined as the distance that light travels in free space (or vacuum) in one second.

The light-second is equal to 299.792458x106 meters (1 light-second = 299.792458x106 m), the base unit of length in the International System of Units (SI). It is also equal to 299.792458x103 kilometers (km) (an SI unit of length), or approximately 186.28x103 miles (mi) or 983.57x106 feet (ft), which are US customary / Imperial units of length.

The light-second is used in astronomy, relativistic physics and telecommunications. Common astronomical measurement units include the parsec (1 light-second ≈ 9.7156x10-9 pc), the astronomical unit (1 light-second = 2.0040x10-3 AU) and the light-year (1 light-second = 31.688x10-9 ly).