# Convert 1 km to mm

So you want to convert 1 kilometers into millimeters? If you're in a rush and just need the answer, the calculator below is all you need. The answer is 1000000 millimeters.

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## How to convert kilometers to millimeters

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 km is equal to 1000000 mm.

Once you know what 1 km is in millimeters, you can simply multiply 1000000 by the total kilometers you want to calculate.

So for our example here we have 1 kilometers. So all we do is multiply 1 by 1000000:

1 x 1000000 = 1000000

## What is the best conversion unit for 1 km?

As an added little bonus conversion for you, we can also calculate the best unit of measurement for 1 km.

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 1 km the best unit of measurement is kilometers, and the amount is 1 km.