# Convert 209 mm to km

So you want to convert 209 millimeters into kilometers? If you're in a rush and just need the answer, the calculator below is all you need. **The answer is 0.000209 kilometers**.

## How to convert millimeters to kilometers

We all use different units of measurement every day. Whether you're in a foreign country and need to convert the local imperial units to metric, or you're baking a cake and need to convert to a unit you are more familiar with.

Luckily, converting most units is very, very simple. In this case, all you need to know is that 1 mm is equal to 1.0E-6 km.

Once you know what 1 mm is in kilometers, you can simply multiply 1.0E-6 by the total millimeters you want to calculate.

So for our example here we have 209 millimeters. So all we do is multiply 209 by 1.0E-6:

## What is the best conversion unit for 209 mm?

As an added little bonus conversion for you, we can also calculate the best unit of measurement for 209 mm.

What is the "best" unit of measurement? To keep it simple, let's say that the best unit of measure is the one that is the lowest possible without going below 1. The reason for this is that the lowest number generally makes it easier to understand the measurement.

**For 209 mm the best unit of measurement is inches, and the amount is 8.2283464566929 in.**

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## More unit conversions

Hopefully this has helped you to learn about how to convert 209 mm to km. If you want to calculate more unit conversions, head back to our main unit converter and experiment with different conversions.