## ››Convert kilometre to light year

 kilometer light year

How many kilometer in 1 light year? The answer is 9460730472580.8.
We assume you are converting between kilometre and light year.
You can view more details on each measurement unit:
kilometer or light year
The SI base unit for length is the metre.
1 metre is equal to 0.001 kilometer, or 1.0570008340246E-16 light year.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between kilometres and light years.
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You can do the reverse unit conversion from light year to kilometer, or enter any two units below:

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## ››Definition: Kilometer

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.

## ››Definition: Light-year

A light year, abbreviated ly, is the distance light travels in one year: roughly 9.46 × 1012 kilometres (9.46 petametres, or about 5.88 × 1012 (nearly six trillion) miles). More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely far away from any gravitational or magnetic fields, in one Julian year (365.25 days of 86400 seconds each).

## ››Metric conversions and more

ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!