How many kilometers in 1 light-second? The answer is 299792.458. We assume you are converting between kilometre and light second. You can view more details on each measurement unit: kilometers or light-second The SI base unit for length is the metre. 1 metre is equal to 0.001 kilometers, or 3.3356409519815E-9 light-second. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between kilometres and light seconds. Type in your own numbers in the form to convert the units!
You can do the reverse unit conversion from light-second to kilometers, or enter any two units below:
A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet.
A light-second is a unit of length. It is defined as the distance light travels in an absolute vacuum in one second or 299,792,458 meters. Note that this value is considered exact, since the meter is actually (as of 1983) defined in terms of the light second. It is just over 186,282 miles and almost 109 feet.
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