# Convert 402 km² to mm²

So you want to convert 402 square kilometers into square millimeters? If you're in a rush and just need the answer, the calculator below is all you need. **The answer is 4.02E+14 square millimeters**.

## How to convert square kilometers to square 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 km² is equal to 1000000000000 mm².

Once you know what 1 km² is in square millimeters, you can simply multiply 1000000000000 by the total square kilometers you want to calculate.

So for our example here we have 402 square kilometers. So all we do is multiply 402 by 1000000000000:

## What is the best conversion unit for 402 km²?

As an added little bonus conversion for you, we can also calculate the best unit of measurement for 402 km².

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 402 km² the best unit of measurement is square meters, and the amount is 402000000 m2.**

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## More unit conversions

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