A light year is a measure of distance that is used to refer to the length that light travels in a year, or in other words, a distance of 9,460,730,472,580.8 kilometers to be more exact. The number is huge and working with it can be tedious, which is why, our **light years to kilometers converter** will allow you to work with the transformation between both units.

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## How much is a light year

As we have said before, **one light year is equivalent to 9,460,730,472,580.8 kilometers.**. Therefore, the light year is a unit of length and not a unit of time as might be thought at first.

If you want the value of a **light year in scientific notation**equals 9.46 × 10^{12} km.

The name light year comes from the fact that it is the distance that light travels in a year. Recall that** la velocidad de la luz es igual a 3x10 ^{8} m/s **

### Why do we measure the distance of the universe in light years and not in kilometers?

This is basically a matter of distance.

**In the universe, distances are very large and the kilometer is very short.** to express lengths, therefore, the light year is a much more suitable unit for measuring the distance between planets, stars, satellites and other elements of space.

Es mucho más cómodo para nosotros decir "1 año luz" que "9.460.730.472.580,8 Kilómetros", y lo mismo sucede a la hora de realizar operaciones. Además, conociendo la **equivalence between light years and kilometers** we can always go from one unit to another with a simple multiplication or division as we are going to see below.

## How to pass light years to km

For **from light years to kilometers** you will have to use the following mathematical formula:

9,460,730,472,580.8 x light years

For example, if we want to calculate how many are **40 light years in kilometers**The result looks like this:

9,460,730,472,580.8 x40 = 378,429,218,903,232 kilometers

If we do **in scientific notation**If we use a rounding method, we obtain a similar result, although with less precision due to rounding issues:

9,46 × 10

^{12}x 40 = 3,784 x 10^{14}

## Convert km to light years

If we want to **convert kilometers into light years**we will have to make the inverse operation, that is to say:

kilometers / 9,460,730,472,580.8

Or in scientific notation:

km / 9.46 × 10

^{12}

For example, how much is** 1 km in light years**? We apply the above formula and we get the following result:

1 km / 9.460.730.472.580,8 = 0,000000000000106 light years

As you can see, **the kilometer is a much smaller unit than the light year**.

## How to convert light years to kilometers in Excel

If at any time you do not have our **light years to km converter**You can create your own Excel converter in a matter of seconds.

Open a new spreadsheet and in an empty cell type the following function:

=CONVERTIR(C1;"ly";"km")

You only have to replace the coordinates C1 with those of the cell in which you have written the **number of light years you want to convert into kilometers**. You can also write there directly the longitude in light years.

For example, if you want to know **how many is 20 light years in kilometers**the formula will be put like this:

=CONVERTIR(20;"ly";"km")

In case you want to do the reverse conversion, ie, **from kilometers to light years in Excel**then you will have to use this other function:

=CONVERTIR(C1;"km";"ly")

If you have any questions about **how to go from light years to km**Leave us a comment and we will help you.

Remember that if you want to **to any other unit** of the international system, you can use our distance unit converter.

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